Download Cooperative breeding in mammals by Solomon N.G., French J.A. (eds.) PDF

By Solomon N.G., French J.A. (eds.)

Cooperative breeding refers to a social process within which members except the fogeys supply deal with the offspring. for the reason that contributors hold up breeding and put money into the offspring of others, cooperative breeding poses a problem to a Darwinian rationalization of the evolution of social habit. The members to this booklet discover the evolutionary, ecological, behavioral, and physiological foundation of cooperative breeding in mammals. The booklet includes a number of chapters by way of the best researchers within the box, and it's the first booklet committed solely to the learn of mammalian cooperative breeding.

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Seed ferns resembled true ferns (pteridophytes) in many ways, but had already evolved seeds. They bridged the gulf between ferns and cycads. The latter are palm-like plants and the pteridosperms were more closely related to them than to pteridophytes. Ferns, tree ferns – which reached to a height of 9–15 m – horsetails and giant club mosses were characteristic of the Carboniferous period. One genus of the club mosses, Sigillaria, grew to ca. 20 m and was one of the main components of the coal forests of the northern hemisphere.

The young could then have spent their early lives in that more sheltered environment before migrating back to the ocean. Like modern varanid lizards and in common with many other reptiles both living and extinct, the mosasaurs probably used their long, whip-like tails to great effect in defence. 1 Choristodera During the late Permian period, two lineages of diapsid reptiles rose to prominence, the Lepidosauria and the Archosauria (see below). Among the former were the Choristodera, a strange assembly of crocodile-like reptiles that diverged from the main diapsid line during the Lower Cretaceous period, some 140 mya.

It roamed over the semi-arid plains of Europe during the Late Triassic, snapping up insects and small lizards with its elongated jaws. No doubt it moved mainly on four limbs but, like its ecological equivalents of today, the frilled lizard (Chlamydosaurus kingii; Agamidae), the basilisk (Basiliscus basiliscus; Iguanidae) and the collared lizard (Crotaphytus collaris; Iguanidae), it would have reached its greatest speed bipedally. It must have sprinted on two legs, not only when in pursuit of prey but – even more importantly – when escaping from predators.

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