RSPB Spotlight Owls
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About this ebook
Owls are charismatic and exceptionally well-loved characters in British wildlife, and have always held a special place in our folklore and legends. Their nocturnal habits mean few of us have been lucky enough to see them up close. In RSPB Spotlight: Owls Marianne Taylor introduces readers to every aspect of their lives including their physiology, biology and behaviour, as well as their history, and future in conservation in Britain and abroad.
Five species of owl currently live in Britain - the Tawny, Barn, Little, Long-eared and Short-eared Owls - and each of them, as well as their relatives abroad, are introduced here in detail alongside top quality colour photographs and fascinating behavioural images, which will delight and inform the whole family.
The book begins with a look at owls in general then examines the five British species in more detail. It discusses their evolutionary history and distribution around the world. Their anatomy and adaptations are examined, as well as their natural behaviours including hunting, nesting and mating practices. Next, we are introduced to their life cycles, beginning as eggs, moving onto fledging and independence, migration, and finally death. Marianne also includes a discussion of conservation as it affects owls, and owls' unique relationships with humans and our culture.
Marianne Taylor
Marianne Taylor is a writer and editor whose career has been steered from the start by her obsessive interest in the natural world. She has written books on subjects from mountain gorillas and nature photography, to science and wildlife in London. She lives in Kent and, when not at her desk, is likely to be found in the nearest woodland, binoculars around neck and notebook in hand.
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RSPB Spotlight Owls - Marianne Taylor
For all items sold, Bloomsbury Publishing will donate a minimum of 2% of the publisher’s receipts from sales of licensed titles to RSPB Sales Ltd, the trading subsidiary of the RSPB. Subsequent sellers of this book are not commercial participators for the purpose of Part II of the Charities Act 1992.
Contents
Meet the Owls
Anatomy and Adaptations
Behaviour
Territory, Competition and Migration
Diet and Hunting
Pairing and Breeding
Life and Death
Owl Conservation
Owls in Culture
Glossary
Further Reading and Resources
Acknowledgements
Image Credits
The ethereal beauty of the Snowy Owl.
Meet the Owls
A haunting, fluted hoot that jolts you out of sleep at 4am. A white ghost freeze-framed in your headlights on a dusk drive home in winter. A furious little face staring at you from the crack in an old barn roof. Encounters with owls in Britain are often startling and always memorable. Few other birds evoke such a strong sense of magic and mystery and – if you meet their gaze – understanding and connection, or at least the illusion of such. It’s almost impossible to look at the face of an owl and not attribute some human quality to its expression.
Secret lives
Wherever we live on the planet, almost all of us know an owl when we see one; its forward-facing eyes seem to burn into our own. Centuries of fanciful folklore have bumped owls higher up in our cultural consciousness than perhaps any other birds, even though most of us only see owls infrequently in our everyday lives, if at all. The nocturnal habits and deep forest habitats of some owls, coupled with predatory powers that seem to almost defy nature and a repertoire of haunting and frightening calls, endow them with a mystique as irresistible as it is potent.
A Tawny Owl sitting at its tree-hole nest is the very image of a 'wise old owl' of the woods.
In this age of television, YouTube and Facebook, we now have opportunities to see owls in action in different settings, without having to take a midnight walk in the woods. Through skilled camerawork we can see for ourselves how owls use their remarkable senses to find and catch their prey, overcoming challenging conditions that most other animals would find impossible to handle. We can also watch rescued or trained captive-bred birds interacting with their keepers, revealing depths of charm, adventurousness and intelligence that vastly add to their appeal. Yet the day-to-day lives of wild owls remain rather mysterious, though our knowledge and understanding of them is growing by the day.
Short-eared Owls seem to be more sociable than most other species, but this behaviour is still not well understood.
In Britain, there are five species of owls regularly breeding in any numbers. That’s a tiny proportion of the world total of more than 200 species. However, these five owls are quite a diverse bunch, in size, shape, colour, habits and personality. In short, they demonstrate five very different ways to be an owl. In addition to these five, a few other species (again, all very different) make occasional ‘guest appearances’ in the wild in Britain.
File under ‘O’
The term ‘bird of prey’ denotes a bird that hunts and eats other vertebrate animals. Many birds, from rails to herons and gamebirds to songbirds, may do this from time to time. However, the title of ‘bird of prey’ usually applies only to the members of three distinct groups, all noted for their predatory ways: the hawks and their allies (eagles, kites, buzzards, harriers and the like); the falcons; and the owls. The differences between owls and the rest have long been acknowledged, and their distinction recognised. Traditionally hawks and falcons are known as ‘diurnal birds of prey’, or ‘raptors’/‘diurnal raptors’, and in field guides they are treated separately to the owls.
Today, biologists can work at the genetic level to investigate how closely related various bird groups really are, and their research has found evidence that the owls may actually be more closely related to the hawks than the falcons are. In any case, the similarities between a buzzard, a kestrel and an owl owe more to convergent evolution (whereby animals that pursue similar lifestyles evolve similar characteristics over time – as with dolphins and fish, for example) than to relatedness. The bird-of-prey lifestyle has arisen separately in two or more distinct bird lineages. Being a hunter of other vertebrates is a good way for a bird to make a living if it is done right. It is much more difficult to catch a relatively large, clever animal than it is to pick up an insect, but just one good-sized ‘kill’ a day is often enough to meet the hunter’s nutritional needs. The specialist hunters in the bird world all have superlative senses to find active, intelligent prey, the brainpower to outwit it, the speed and strength to overcome and catch it, and the physical equipment of talons and a hooked bill to kill and consume it.
According to some systems of classification, the owls’ closest relatives are not other birds of prey, but a group of insect-eaters, the nightjars. Although nightjars are not fearsome killers (unless you happen to be a moth), they do have traits in common with owls – a nocturnal lifestyle with all the sensory adaptations that entails, and beautifully camouflaged plumage so they can sleep all day without easily being discovered.
The Goshawk, a typical example of the largest family of birds of prey.
Like owls, nightjars are nocturnal, and chase down insect prey in flight.
Families and genera
Birds are grouped in the taxonomic class Aves, which is subdivided into about 30 major groups or orders. One of these is Strigiformes, the owl order, and it contains two families – Tytonidae (the barn owls and bay owls – about 16 species in all) and Strigidae (all the rest – nearly 200 species). The barn owls and bay owls are clearly distinct from other owls – they are relatively small-eyed and long-faced, with softly mottled (rather than more strongly spotted and barred) plumage patterns and long wings and legs. The barn-owls form the genus Tyto, the bay-owls the genus Phodilus.
The family Strigidae contains about 28 genera. The five largest genera, between them holding about three-quarters of all owl species, are Otus (the scops owls), Ninox (the boobooks or hawk-owls), Glaucidium (the pygmy owls), Strix (the wood owls), and Bubo (the eagle owls and fish-owls). The smaller genera, with only a handful of species apiece, include Asio, the eared owls, and Athene, the little owls. However, in terms of global distribution they punch well above their weight, with some very widespread species.
Each genus has its own set of distinctive traits. The scops-owls are very small, well-camouflaged owls with slim bodies and obvious ear tufts, and are only found in the Old World. The screech-owls are their New World equivalents. The Ninox owls are native to East Asia and Australasia and are the least ‘owl-like’ of owls, having relatively small heads and long tails, and a more hawk-like general appearance, with no ear tufts. Pygmy-owls also lack ear tufts. They are found mainly in the Americas and are very small, but are fierce predators for their size. The eagle-owls are the largest, and include some huge and very powerful predators. They have ear tufts and very bulky physiques. The wood-owls are medium to large woodland owls with excellent camouflage and particularly sedentary habits. Little owls are small and often diurnal owls of more open habitats, and the eared owls are mostly