FOR long we have accepted as well-established and equivalent the five classes of vertebrate animals, but recent zoological ... of the vertebrate phylogenetic tree, most of the branches being ...

Evolutionary trees show how different species have evolved ... So the question is, why? How could an animal be so precisely adapted to a particular lifestyle? The answer is natural selection.

All animal evolution for the last half billion years has come from tinkering with these Cambrian body plans. Then, between about 570 and 530 million years ago, another burst of diversification ...

We have been researching the evolution of primate litter size ... of as many species as possible across the mammalian family tree and then use mathematical algorithms to look for patterns.