Grass is not easily digestible and most animals that eat it have to regurgitate it and chew the cud.

Three paperbacks(a couple of creases,nicks and scratch on the covers) with a slipcase(a couple of nicks and scratches on the slipcase),both in fine condition. The evolution of shelled creatures is demonstrated with the flatworm, which eventually changed its body shape when burrowing became a necessity for either food or safety. Boston: Little, Brown and Company, c1979 First American Edition 319pp, index, color photographs Imperial 8vo Previous owner's writing on first white page, else fine hardcover in fine d/j. Its cover image of a Panamanian red-eyed tree frog, was taken by Attenborough himself, [9] became an instantly recognisable emblem of the series. Various methods of breeding are examined, including laying eggs in rivers, depositing them in other damp habitats for safety or, as with the Brazilian pipa, embedding them within the skin of the parent itself.Since mammals have warm blood and most have dense fur, they can hunt at night when temperatures drop. The chapter on reptiles shows how they evolved from their ancestors, how they spread over the land and became the rulers of the world - the dinosaurs - and how even these massive animals fell victim to some unknown mishap, leaving the earth in turn to become populated by our ancestors, the primitive mammals. The herbivores began to populate the forests when the dinosaurs disappeared, and many took to gathering food at night. At the time, Darwin was far from being an atheist – he had, after all, taken a degree in divinity at Cambridge University – but he was deeply puzzled by this enormous multiplicity of forms. Continuity was maintained, despite such sequences being filmed several months and thousands of miles apart.

This episode continues the study of mammals, and particularly those whose young gestate inside their bodies.

They have cleared up one of the great and most vehement arguments among evolutionary biologists about the origins of both flight and the birds. Howler monkeys demonstrate why they are so named—their chorus is said to the loudest of any mammal—and their prehensile tails illustrate their agility. Will usually dispatch within same working day if paid before 14:00 GMT (excludes weekends and holidays).

Life’s evolutionary steps – from the development of a digestive system to the awe of creatures taking to the skies in flight – are conveyed with an up-close intimacy. Delve into the astonishing story of the evolution of myriad animals and plants that have evolved on our planet - and those that are now endangered by a vast range of issues.In 1832 a young Englishman, Charles Darwin, twenty-four years old and naturalist on HMS Beagle, a brig sent by the Admiralty in London on a surveying voyage round the world, came to such a forest outside Rio de Janeiro. Those that survived were water-dwellers, and the bull Nile crocodile is the largest reptile alive today. Not until 1859, when he was forty-eight years old, did he publish it, and even then he was driven to do so only because another younger naturalist, Alfred Wallace, working in Southeast Asia, had formulated the same idea.