Thetawny owl (Strix aluco), also called thebrown owl, is a stocky, medium-sizedowl in the familyStrigidae. It is commonly found inwoodlands across Europe, as well as westernSiberia, and has seven recognizedsubspecies. The tawny owl's underparts are pale with dark streaks, whilst its upper body may be either brown or grey (in several subspecies, individuals may be of both colours). The tawny owl typically makes itsnest in atree hole where it can protect its eggs and young against potential predators. It isnon-migratory and highly territorial: as a result, when young birds grow up and leave the parental nest, if they cannot find a vacant territory to claim as their own, they will often starve.
The tawny owl is anocturnalbird of prey. It is able to hunt successfully at night because of its vision, hearing adaptations and its ability to fly silently. It usually hunts by dropping suddenly from a perch and seizing its prey, which it swallows whole. It mainly huntsrodents, although in urbanized areas its diet includes a higher proportion of birds. It also sometimes catches smaller owls, and is itself sometimes hunted by theeagle owl and theEurasian goshawk.
Itsretina is no more sensitive than a human's. Its directional hearing skill is more important to its hunting success: its ears are asymmetrically placed, which enables it to more precisely pinpoint the location from which a sound originates.
The tawny owl holds a place in human folklore: because it is active at night and has what many humans experience as a haunting call, people have traditionally associated it with bad omens and death. Many people think that all owl species make a hooting sound, but that is an overgeneralization based on the call of this particular species. In addition, the double hoot, which many people think is the tawny owl’s prototypical call, is actually a call and response between a male and a female.[3][4]
Juvenile specimen of a tawny owlField of view compared with a pigeon[image reference needed]An owl's retina has a single fovea.[5]Hooting song, Gloucestershire, England, 1978'Kewick' calls, England, 1960s
The tawny owl is a robust bird, 37–46 cm (15–18 in) in length, with an 81–105 cm (32–41 in) wingspan. Weight can range from 385 to 800 g (0.849 to 1.764 lb).[6][7] Its large rounded head lacks ear tufts, and the facial disc surrounding the dark brown eyes is usually rather plain. Thenominate race has twomorphs which differ in theirplumage colour, one form having rufous brown upperparts and the other greyish brown, although intermediates also occur. The underparts of both morphs are whitish and streaked with brown.[8] Feathers are moulted gradually between June and December.[9] This species issexually dimorphic; the female is much larger than the male, 5% longer and more than 25% heavier.[10]
The tawny owl flies with long glides on rounded wings, less undulating and with fewer wingbeats than other Eurasian owls, and typically at a greater height. The flight of the tawny owl is rather heavy and slow, particularly at takeoff,[11] though the bird can attain a top flight speed of around 50 mph.[12] As with most owls, its flight is silent because of its feathers' soft, furry upper surfaces and a fringe on the leading edge of the outerprimaries.[13] Its size, squat shape and broad wings distinguish it from other owls found within its range; thegreat grey owl (Strix nebulosa),Eurasian eagle-owl (Bubo bubo) andUral owl (Strix uralensis) are similar in shape, but much larger.[11]
An owl's eyes are placed at the front of the head and have a field overlap of 50–70%, giving it betterbinocular vision than diurnal birds of prey (overlap 30–50%).[14] The tawny owl'sretina has about 56,000 light-sensitiverod cells per square millimetre (36 million per square inch); although earlier claims that it could see in theinfrared part of thespectrum have been dismissed,[15] it is still often said to haveeyesight 10 to 100 times better than humans in low-light conditions. However, the experimental basis for this claim is probably inaccurate by at least a factor of 10.[16] The owl's actual visual acuity is only slightly greater than that of humans, and any increased sensitivity is due to optical factors rather than to greater retinal sensitivity; both humans and owl have reached the limit of resolution for the retinas of terrestrialvertebrates.[16]
Adaptations to night vision include the large size of the eye, its tubular shape, large numbers of closely packed retinal rods, and an absence ofcone cells, sincerod cells have superior light sensitivity. There are few coloured oil drops, which would reduce the light intensity.[17] Unlike diurnal birds of prey, owls normally have only onefovea, and that is poorly developed except in daytime hunters such as theshort-eared owl.[14]
Hearing is important for a nocturnalbird of prey, and as with other owls, the tawny owl's two ear openings differ in structure and are asymmetrically placed to improve directional hearing. A passage through the skull links the eardrums, and small differences in the time of arrival of a sound at each ear enables its source to be pinpointed. The left ear opening is higher on the head than the larger right ear and tilts downward, improving sensitivity to sounds from below.[14] Both ear openings are hidden under the facial disk feathers, which are structurally specialized to be transparent to sound, and are supported by a movable fold of skin (the pre-aural flap).[18]
The internal structure of the ear, which has large numbers of auditoryneurons, gives an improved ability to detect low-frequency sounds at a distance, which could include rustling made by prey moving in vegetation.[18] The tawny owl's hearing is ten times better than a human's,[18] and it can hunt using this sense alone in the dark of a woodland on an overcast night, but the patter of raindrops makes it difficult to detect faint sounds, and prolonged wet weather can lead to starvation if the owl cannot hunt effectively.[14]
The commonly heard female contact call is a shrill,kew-wick but the male has a quavering advertising songhoo...ho, ho, hoo-hoo-hoo-hoo.William Shakespeare used this owl's song inLove's Labour's Lost (Act 5, Scene 2) as "Then nightly sings the staring owl, Tu-whit; Tu-who, a merry note, While greasy Joan doth keel the pot", but thisstereotypical call is actually a duet, with the female making thekew-wick sound, and the male respondinghooo.[8] The call is easily imitated by blowing into cupped hands through slightly parted thumbs, and a study inCambridgeshire found that thismimicry produced a response from the owl within 30 minutes in 94% of trials.[19] A male's response to a broadcast song appears to be indicative of his health and vigour; owls with higher blood parasite loads use fewer high frequencies and a more limited range of frequencies in their responses to an apparent intruder.[20] The vocal activity of tawny owls depends on sex, annual cycle stage and weather, with males being more vocal than females year-round, with peak vocal activity during incubation and post-breeding.[21]
Although both colourmorphs occur in much of the European range, brown birds predominate in the more humid climate of western Europe, with the grey morph becoming more common further east; in the northernmost regions, all the owls are a cold-grey colour. The Siberian andScandinavian subspecies are 12% larger and 40% heavier, and have 13% longer wings than western European birds,[18] in accordance withBergmann's rule which predicts that northern forms will typically be bigger than their southern counterparts.[22]
The plumage colour isgenetically controlled, and studies in Finland and Italy indicate that grey-morph tawny owls have more reproductive success, better immune resistance, and fewerparasites than brown birds. Although this might suggest that eventually the brown morph could disappear, the owls show no colour preference when choosing a mate, so theselection pressure in favour of the grey morph is reduced. There are also environmental factors involved. The Italian study showed that brown-morph birds were found in denser woodland, and in Finland,Gloger's rule would suggest that paler birds would in any case predominate in the colder climate.[23][24]
The tawny owl is a member of the wood-owl genusStrix, part of thetypical owl family Strigidae, which contains all species of owl other than thebarn owls. Within its genus, the tawny owl's closest relatives areHume's owl,Strix butleri, (formerly considered to beconspecific), theHimalayan owl,Strix nivicolum, (sometimes considered conspecific), its larger northern neighbour, theUral owl,S. uralensis, and theNorth Americanbarred owl,S. varia.[18] TheEarly–Middle PleistoceneStrix intermedia is sometimes considered apaleosubspecies of the tawny owl, which would make it that species' immediate ancestor.[26]
The tawny owlsubspecies are often poorly differentiated, and may be at a flexible stage of subspecies formation with features related to the ambient temperature, the colour tone of the local habitat, and the size of available prey. Consequently, various authors have historically described between 10 and 15 subspecies.[18] The seven currently recognised subspecies are listed below.[27]
Subspecies
Range
Described by(parentheses indicate originally in a different genus)
S. a. aluco
north and central Europe from Scandinavia to the Mediterranean and Black Sea
Ancient deciduous woodland is a favoured habitatTawny owl hiding on a tree
The tawny owl isnon-migratory and has a distribution stretching discontinuously across temperate Europe, from Great Britain and theIberian Peninsula eastwards to westernSiberia. It is absent fromIreland - probably because of competition from thelong-eared owl (Asio otus) - and only a rare vagrant to theBalearic andCanary Islands.[11] In the Himalayas and East Asia it is replaced by theHimalayan owl (Strix nivicolum) and in northwest Africa it is replaced by the closely relatedMaghreb owl (Strix mauritanica).[27]
This species is found indeciduous and mixed forests, and sometimes matureconifer plantations, preferring locations with access to water. Cemeteries, gardens and parks have allowed it to spread into urban areas, including centralLondon. Although tawny owls occur in urban environments, especially those with natural forests and wooded habitat patches, they are less likely to occur at sites with high noise levels at night.[28] The tawny owl is mainly a lowland bird in the colder parts of its range, but breeds to 550 metres (1,800 ft) in Scotland, 1,600 m (5,200 ft) in theAlps, 2,350 m (7,710 ft) inTurkey,[11] and up to 2,800 m (9,200 ft) inMyanmar.[18]
The tawny owl has a geographical range of at least 10 million km2 (3.8 million mi2) and a large population including an estimated 970,000–2,000,000 individuals in Europe alone. Population trends have not been quantified, but there is evidence of an overall increase. This owl is not believed to meet theIUCN Red List criterion of declining more than 30% in ten years or three generations and is therefore evaluated as being ofleast concern.[1] In the UK it is on theRSPB Amber List of Concern.[29] This species has expanded its range in Belgium, the Netherlands, Norway andUkraine, and populations are stable or increasing in most European countries. Declines have occurred in Finland, Estonia, Italy and Albania.[11] Tawny owls are listed in Appendix II of theConvention on International Trade in Endangered Species (CITES) meaning international trade (including in parts and derivatives) is regulated.[2]
Tawny owls pair off from the age of one year, and stay together in a usuallymonogamous relationship for life. An established pair's territory is defended year-round and maintained with little, if any, boundary change from year to year. The pair sit in cover on a branch close to a tree trunk during the day, and usually roost separately from July to October.[11] Roosting owls may be discovered and "mobbed" by small birds during the day, but they normally ignore the disturbance.[18] Tawny owls are very territorial, and will indicate the location of their chosen territory by their vocalisations, which occur at their greatest frequency during the night, though some owls will continue to call during the day. The owl's home range is determined in early autumn, and the territory is defended throughout the winter and into spring when the breeding season begins.[30]
The tawny owl typically nests in ahole in a tree, but will also use oldEuropean magpie nests,squirreldrey or holes in buildings, and readily takes tonest boxes. It nests from February onwards in the south of its range, but rarely before mid-March inScandinavia.[11] The glossy white eggs are 48 mm × 39 mm (1.9 in × 1.5 in) in size and weigh 39.0 g (1.38 oz), of which 7% is shell. The typical clutch of two or three eggs is incubated for 30 days to hatching, and thealtricial, downy chicksfledge in a further 35–39 days.[10] Incubation is usually undertaken by the female alone, although the male has rarely been observed to assist.[31] The young usually leave the nest up to ten days before fledging, and hide on nearby branches.[11]
This species is fearless in defence of its nest and young, and, like otherStrix owls, strikes for the intruder's head with its sharp talons. Because its flight is silent, it may not be detected until it is too late to avoid the danger. Dogs, cats and humans may be assaulted, sometimes without provocation.[18] Perhaps the best-known victim of the tawny owl's fierce attack was the bird photographerEric Hosking, who lost his left eye when struck by a bird he was attempting to photograph near its nest in 1937. He later called his autobiographyAn Eye for a Bird.[32]
The parents care for young birds for two or three months after they fledge, but from August to November the juveniles disperse to find a territory of their own to occupy. If they fail to find a vacant territory, they usually starve.[11] The juvenile survival rate is unknown, but the annual survival rate for adults is 76.8%. The typical lifespan is five years,[10] but an age of over 18 years has been recorded for a wild tawny owl, and of over 27 years for a captive bird.[18]
Predators of the tawny owl include large birds such asUral owls,eagle owls,Eurasian goshawks,golden eagles, andcommon buzzards.Pine martens may raid nests, especially where artificial nest boxes make the owls easy to find, and several instances have been recorded ofEurasian jackdaws building nests on top of a brooding female tawny owl leading to the death of the adult and chicks.[18] ADanish study showed that predation by mammals, especiallyred foxes, was an important cause of mortality in newly fledged young, with 36% dying between fledging and independence. The mortality risk increased with fledging date from 14% in April to more than 58% in June, and increasing predation of late broods may be an important selective agent for early breeding in this species.[33]
This species is increasingly affected byavian malaria, the incidence of which has tripled in the last 70 years, in parallel with increasing global temperatures. An increase of one degree Celsius produces a two- to three-fold increase in the rate of malaria. In 2010, the incidence in British tawny owls was 60%, compared to 2–3% in 1996.[34]
The tawny owl hunts almost entirely at night, watching from a perch before dropping or gliding silently down to its victim, but very occasionally it will hunt in daylight when it has young to feed. This species takes a wide range ofprey, mainly woodlandrodents, but also othermammals up to the size of a youngrabbit, andbirds,earthworms andbeetles. In urban areas, birds make up a larger proportion of the diet, and species as unlikely asmallard andkittiwake have been killed and eaten.[11]
Prey is typically swallowed whole, with indigestible parts regurgitated aspellets. These are medium-sized and grey, consisting mainly of rodent fur and often with bones protruding, and are found in groups under trees used for roosting or nesting.[13]
Less powerful woodland owls such as thelittle owl and thelong-eared owl cannot usually co-exist with the stronger tawny owls, which may take them as food items, and are found in different habitats; inIreland the absence of the tawny owl allowed the long-eared owl to become the dominant owl. Similarly, where the tawny owl has moved into built-up areas, it tends to displacebarn owls from their traditional nesting sites in buildings.[18]
The tawny owl, like its relatives, has often been seen as an omen of bad luck;William Shakespeare used it as such inJulius Caesar (Act 1 Scene 3): "And yesterday the bird of night did sit/ Even at noon-day upon the market-place/ Hooting and shrieking."John Ruskin is quoted as saying "Whatever wise people may say of them, I at least have found the owl's cry always prophetic of mischief to me".[35]
Wordsworth described the technique for calling an owl in his poem "There Was a Boy".[36]
And there, with fingers interwoven, both hands Pressed closely palm to palm and to his mouth Uplifted, he, as through an instrument, Blew mimic hootings to the silent owls, That they might answer him.—And they would shout Across the watery vale, and shout again, Responsive to his call,—with quivering peals, And long halloos, and screams, and echoes loud Redoubled and redoubled; concourse wild Of jocund din!
^Based on Güntürkün, Onur, "Structure and functions of the eye" inSturkie, P. D. (1998).Sturkie's Avian Physiology. 5th Edition. Academic Press, San Diego. pp. 1–18.ISBN978-0-12-747605-6.
^CRC Handbook of Avian Body Masses by John B. Dunning Jr. (Editor). CRC Press (1992),ISBN978-0-8493-4258-5.
^abBrown, Roy; Ferguson, John; Lawrence, Michael; Lees, David (1987).Tracks and Signs of the Birds of Britain and Europe (Helm Identification Guides). Christopher Helm. p. 86.ISBN978-0-7470-0201-7.
^Galeotti, Paolo; Sacchi, Roberto (2003). "Differential parasitaemia in the tawny owl (Strix aluco): effects of colour morph and habitat".Journal of Zoology.261:91–99.doi:10.1017/S0952836903003960.
^Linnaeus, C (1758).Systema naturae (in Latin). Lars Salvius. p. 93.S. capite laevi, corpore ferrugineo, iridíbus atris, remi-gibus primoribus serratís.
^(in German) Jánossy D. (1972) "Die mittelpleistozäne Vogelfauna der Stránská skála". In: Musil R. (ed.): "Stránská skála I."Anthropos (Brno)20: 35–64.
^abGill, Frank; Donsker, David;Rasmussen, Pamela, eds. (January 2022)."Owls".IOC World Bird List Version 12.1. International Ornithologists' Union. Retrieved2 March 2022.
^Fröhlich, A.; Ciach, M. (2018). "Noise pollution and decreased size of wooded areas reduces the probability of occurrence of Tawny OwlStrix aluco".Ibis.160 (3):634–646.doi:10.1111/ibi.12554.
^"RSPB Red Amber & Green List".RSPB Red Amber & Green Lists Explained. Royal Society for the Protection of Birds. Retrieved10 December 2017.
^Hosking, Eric; Lane, Frank W. (1972).An Eye for a Bird: The Autobiography of a Bird Photographer. London, Hutchinson & Co. p. 20.ISBN978-0-09-104460-2.
^Sunde, Peter (September 2005). "Predators control post-fledging mortality in tawny owls,Strix aluco".Oikos.110 (3):461–472.doi:10.1111/j.0030-1299.2005.14069.x.
^Armstrong, Edward A. (1958).The Folklore of Birds: An Enquiry into the Origin and Distribution of Some Magico-Religious Traditions. London: Collins. p. 114.
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