Download A Photographic Guide to Birds of Southern Africa by Ian Sinclair PDF

By Ian Sinclair

Характеризует 750 видов южноафриканских птиц, включая не только резидентные и размножающиеся, но и большинство мигрантов. Фотографии, многие их которых демонстрируют птиц в полете, иллюстрируют разнообразие форм и раскрасок.
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Additional resources for A Photographic Guide to Birds of Southern Africa

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4. In Madagascar, prosimians and tenrecs estivate during the winter to avoid cooler dry weather. 5. Excluding the Arctic ground squirrel, which cannot burrow deeply due to the permafrost, and is then surrounded by frozen soil when the shallow top layer refreezes. 6. The processes and functions of an organism. 7. Some northern frogs store glycogen (a carbohydrate and the storage form of glucose) in their livers; it is converted to glucose and functions as a cryoprotectant. 8. A kcal is the amount of heat needed to raise 1 kg of water by 18C.

They are heavy-bodied and powerful eel-like carnivores, and are very aggressive and fearless hunters. They are all obligate air-breathers and their lungs are similar to those of the ancient amphibians, being modified swim bladders, which most fish use for buoyancy and which in the lungfish absorb oxygen and remove carbon dioxide. They all have double or paired lungs, except the Australian lungfish, which has a single one. There are six species of lungfish, four in Africa, and one each in South America and Australia.

Within the Arctic Circle this period can be extended to nine months for species such as the Arctic ground squirrel and the Eurasian reptiles—the adder and viviparous lizard. Elsewhere, such as the desert regions of the southwestern United States, droughts may result in the normal periods of estivation and hibernation running continuously so that animals like the spadefoot toads may be torpid for eighteen months. But the dormant hibernators do not sleep solidly for their whole term as once believed, and even those that sleep deeply awaken quite regularly.

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