Read e-book online Birds: Their habits and skills PDF

By Gisela Kaplan, Lesley J. Rogers

ISBN-10: 1865083763

ISBN-13: 9781865083766

This booklet lacks wonderful photographs that are more and more used to draw readers. although, there's a lot of fascinating information regarding birds' lives for the intense chook fanatics. As from the again of the e-book attempting to attract its readers:-

Why do pigeons bob their heads after they walk?
Can speaking parrots comprehend what they say?
What do birds research and remember?

Explanations are drawn from a number of ornithological reports and researches. What will be greater than a brief harvest from years of attempt of the ornithologists in a number of hours? it is possible for you to to faucet many killer themes for you subsequent chat along with your fellow birders.

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Additional resources for Birds: Their habits and skills

Sample text

Hence, flightlessness is more common in species living in warmer climates and in isolation from predators, particularly larger mammals that hunt them on the ground. These conditions occur most often on islands. New Zealand, for example, has a number of flightless species, all quite unrelated. The now extinct New Zealand owlet-nightjar was almost completely flightless. It was similar to the existing owlet-nightjars of Australia and New Guinea but had larger legs, adapted to living continuously on the ground.

75 Other scientists believe that the present-day ratites all evolved from an ancestor that could fly which arrived at the various continents by air and evolved flightlessness in each locality. This hypothesis is supported, to some extent, by fossil ratites found in the Northern Hemisphere. Broadly speaking, birds appear to take the opportunity to give up their ability to fly whenever possible. When they do, they lose some of their special adaptations for flight and acquire new functions to exploit new sources of food and to give their offspring a better start in life.

Females do not always incubate the eggs. The emu male incubates the eggs, usually of several females, and then guards his chicks until they are seven months old. In another flightless bird, the New Zealand kiwi, incubation takes eleven weeks (the longest of any bird) and is done by the male. In quite a number of species, other variations occur. For instance, in the black-winged stilt, the female initiates breeding by invading the male’s feeding territory, but she incubates alone; with the vulturine guinea fowl, the female incubates the eggs but the male broods and feeds the young for the first few days.

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Birds: Their habits and skills by Gisela Kaplan, Lesley J. Rogers


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