Tawny Owl

Strix aluco

The Tawny Owl is a carnivorous night hunter common throughout Europe and western Asia with pockets found within the Middle East and the Indian sub-continent. It shouldn’t be confused with the Tawny Fish-owl of East Asia, the Tawny-bellied Screech owl of South America nor the Tawny-browed owl found on the eastern side of South America. The tawny owl is also occasionally referred to as the Brown Owl.

Other names:

Brown Owl, Eurasian Tawny Owl

Family:

Owls

Length:

37cm to 39cm

Wingspan:

94cm to 104cm

Weight:

330g to 590g

Tawny Owl

What does a Tawny Owl look like?

The tawny owl is a stocky, medium sized owl with a large round head and large forward facing dark coloured eyes. Whilst the adult female is larger than the adult male both sexes are similar with regards to their plumage. There is however an anomaly with the tawny owl in that its plumage is polymorphic, meaning that the bird can appear in one of two dominant colour morphs, either grey or brown.

Tawny owls have either brown or grey mottled upperparts with dark streaks and paler underparts with very dark thin vertical streaks with occasional cross barring. Where the bird is predominantly brown then the rest of the plumage has a brown hue and where the morph is of a grey colour then the remaining base colour is grey. Whatever the colour morph, in ornithological circles it is described as being cryptic. This means that the plumage colour and patternation is such as to camouflage the individual bird to such an extent so as to make it almost invisible when in its natural environment.

Close up of a Tawny Owl face

Close up of a Tawny Owl face

The facial disc is pale, almost off white (sometimes tinged either buff or light grey) with highlighted darker concentric circles and the crown of the head has a very dark central band running from the top of the bill to the back of the head. The remainder of the head mirrors the colouration of the bird’s upper parts.

The wings are rounded with the upperwing coverts tipped white. The outer primary flight feathers are fringed and this, coupled with the soft upper surface of the remainder of the wing, allows the bird to be almost silent in flight. Underwing area is pale with base colour barring and the legs are feathered.

Talons are grey or blackish and the bill is hooked and a pale olive yellow. The forward facing eyes appear almost black and cannot be moved within their sockets which is the reason that the tawny owl is able to turn its head through a 270° arc and is able to see behind it.

Tawny owl chicks are altricial and covered in a soft white down.

Tawny Owl Owlets

Tawny Owl Owlets

The seven subspecies of Tawny Owl

The seven subspecies of tawny owl are differentiated from the nominate predominantly by minor variations in size and plumage and on the geographical area of their habitats which range from the Indian sub-continent to Western Europe and Britain, the Caucasus to the Persian Gulf and the Urals to Tajikistan. This article concentrates mainly on the nominate, Strix aluco.

How big is a Tawny Owl?

With a body length of between 37 – 39 cm (14.5 – 15.5 in) the adult tawny owl is shorter in length than the Common Wood Pigeon. For an owl of its size its wing span is relatively short at 94 – 104 cm (37 – 41 in) which allows for quick and easy flight through woodland areas, its preferred habitat.

Tawny Owl in flight

Tawny Owl in flight

How much does a Tawny Owl weigh?

The adult male has an average weight of around 440 g or 15.5 oz which equates roughly to just under half the weight of a standard bag of shop bought sugar. The adult female is heavier than its mate averaging 553 g or 19.5 oz.

What is the scientific name for a Tawny Owl?

The tawny owl is classified as belonging to the family known as Strigadae which consists of 225 species of owls. The genus of the tawny owl, which is best defined as being the name of a specimen between family and species, is Strix of which there are 19 individual species.

The word strix is derived from the ancient Greek word meaning owl. The scientific name for the tawny owl is Strix aluco with the word aluco denoting the owl’s species. This latter word comes from the Italian ‘alocho’ meaning tawny owl which originated from the Latin word ‘uluccus’ meaning screech owl.

Tawny Owl perched on a rock

Tawny Owl perched on a rock

Are Tawny Owls aggressive?

Tawny owls can be incredibly aggressive, particularly during the breeding season when they have young in their nest. They will often attack unsuspecting animals and even humans whom they may consider a threat, by swopping down from above and using their sharp talons as extremely effective weapons.

Scientists engaged in the ringing of tawny owl chicks have been known to wear crash helmets and visors as protection against attack. Tawny owls are also very territorial and will defend their territory against outsiders and other ’trespassing’ birds.

How long do Tawny Owls live for?

Life expectancy for the tawny owl is generally accepted as being 5 years. Predation will often result in high chick mortality rates and juveniles who leave the nest area to establish their own territories can often starve to death if no vacant territories can be found. There have been instances where tawny owls have survived much longer than the accepted average with a ringed individual achieving 18 years and a specimen in captivity living over 25 years.

Tawny Owl flying

Tawny Owl flying

Are Tawny Owls endangered?

Within the United Kingdom Conservation Status criteria, tawny owls are classified as Amber, whereas under the International Union for Conservation of Nature (IUCN) they are listed as being of Least Concern. In other words they are not considered, at this time, as being endangered.

What does a Tawny Owl eat?

Tawny owls are superb night hunters and will glide silently over their territory hunting for prey or stand motionless on a favourite perch watching and more importantly listening for the telltale movement of their next meal. They are almost totally carnivorous choosing a diet of small birds and mammals, reptiles and amphibians, insects, snails, beetles and worms.

Within the United Kingdom, where they are arguably the most common owl, their diet consists in the main of what is available to them within their territory during a particular season, predominantly voles, mice and shrews, as opposed to what their individual preference may be.

Tawny Owl with captured mouse in beak

Tawny Owl with captured mouse in beak

Do Tawny Owls mate for life?

Once mature and of breeding age, from approximately twelve months old, tawny owls begin looking for a mate and once found they generally pair for life and are therefore classed as monogamous.

Where do Tawny Owls nest?

Tawny owls often nest in abandoned nests of other large bird species or tree cavities within open mixed forests or broadleaf woodlands. Nesting boxes and nooks in buildings or chimneys are also utilised and within certain geographical areas (e.g. Scotland) they will even nest upon the ground.

Tawny Owl owlet in nest in a tree

Tawny Owl owlet in nest in a tree

How many eggs does a Tawny Owl lay?

The tawny owl will normally lay one brood annually between the months of February to July. The preferred laying period is dependent upon geographical location and climate. Eggs are laid at intervals of a couple of days which ensures that they hatch asynchronously meaning there are intervals between each egg hatching. Although observations have recorded the number of eggs laid in each clutch ranging from between 2 to 9, the number most commonly produced varies from 3 to 5.

The female parent alone incubates the eggs for up to 30 days during which time she is fed by the male. Upon hatching chicks are altricial meaning they are underdeveloped and reliant upon their parents for food and protection.

Fledging occurs 35 to 39 days later although chicks will often leave the nest earlier than this and roost on nearby branches where they will continue to be fed by their parents. Juvenile owls are generally fully independent by the time they attain three months of age. There is often an extremely high mortality rate during the tawny owl’s first twelve months of life.

Tawny Owl eggs

Tawny Owl eggs

What do Tawny Owl eggs look like?

Tawny owl eggs are a plain gloss white in colour and much smaller than even the smallest chicken egg, averaging some 48 mm x 39 mm in size (1.9 in x 1.5 in) and weighing in at around 39 g or 1.4 oz.

What does a Tawny Owl sound like?

The vocalisations of male and female tawny owls differ with the female issuing a medium to high pitched almost screech like, ‘kew – wick, kew – wick’ sound whereas the male sings with a low pitched, haunting whistle or hoot, frequently repeated as in ‘hooo – hooo – hooo’.

This has often been interpreted as a ‘ta-wit ta-woo’ sound where in fact the female’s ‘kew – wick’ sound is made first (‘ta-wit’) followed by the male’s response of ‘hooo’ (erroneously described as being ‘ta-woo’).

This archetypal owl noise is often used in films to create a spooky atmosphere at night and it has come to epitomise the genre even though the tawny owl may not be a resident in many of the portrayed locations.

Tawny Owl landing on a tree branch

Tawny Owl landing on a tree branch

What is the habitat of a Tawny Owl?

Tawny owls are, in the main, lowland birds who prefer open woodland and forest habitats of mainly broadleaf (deciduous) trees or mixed copses, although they will occasionally choose coniferous woods when left with no alternative. Whilst they will avoid treeless plains and landscapes they will populate urban parks, gardens, scrubland and farmland provided there are trees (particularly mature tress) within the immediate area.

Tawny owls are particularly territorial in nature and will usually defend an area of between 30 to 50 acres in size which they consider to be theirs alone. To understand the size of an owl’s territory we could compare it to that of a normal size soccer pitch (to include the immediate touchline area) which is calculated as being 2 acres. Thus, a pair of adult tawny owls will occupy a territory the size of between 15 to 25 soccer pitches which they will rarely, if ever leave.

Tawny Owl perched during the winter

Tawny Owl perched during the winter

Where can I see Tawny Owls?

Certainly within Europe the tawny owl is a common resident although not always easy to spot. Not only does their plumage offer excellent camouflage within their usual surroundings, they are also night hunters and during the day seldom move from their nest or roosting spot and are in fact exceptionally sedentary, using the minimal amount of physical activity.

Remember that tawny owls can be very aggressive, particularly in the breeding season and will often attack unsuspecting creatures, including humans, that they consider may be a danger to themselves or their offspring, so take care and avoid the immediate vicinity of nests.

Tawny Owl perched on a tree

Tawny Owl perched on a tree

Within the United Kingdom the tawny owl is the most common species of owl, although it is not found in Ireland. Careful observation around typical tawny owl habitats, particularly during dusk or dawn, can often result in a rewarding glimpse of a hunting tawny, especially when combined with prior knowledge obtained from hearing the unmistakable hooting sounds of an adult male.

Whilst walking through woods a telling sign of the presence of a tawny owl can also be the discovery of pellets at the base of a tree or underneath a branch. Many birds expel pellets by regurgitation, which are made up of undigestible feathers, fur, bones and other matter they may have consumed during a previous meal. Owl pellets are predominantly grey in colour and can often be found immediately below a nest or favourite perch.

Owl sanctuaries are also not uncommon within the western world, often caring for sick or injured birds and offer the chance to observe these beautiful creatures at close hand.

Do Tawny Owls migrate?

Tawny owls do not migrate. They are monogamous and remain within their own territory throughout their lives. Juvenile tawny owls are chased away from the parental territory during their first autumn and must find their own territory and mate which is seldom any great distance from the area in which they originated. The high death rate of first year juveniles is often attributed to starvation following their parental expulsion and inability to find food and/or territory.

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