We move on to consider the evolution of mate choice, and then we describe the types of mating systems found in animals. Sexual reproduction often involves evolutionary differentiation of males and ...

By identifying specific traits — such as size, coat color, and demeanor — and allowing only those animals to mate, we've created at least 167 different "breeds," or groups of dogs with unique ...

These are either behavioral or structural differences between species that make mating impossible ... skinks breed in winter, while western spotted skinks breed in summer. Different firefly ...

Unlike many young from hybrid species, ligers and tigons can have offspring. Five very different breeds of dog. Pedigree dogs come in lots of different varieties. They may be different colours and ...

Unlike many young from hybrid species, ligers and tigons can have offspring. Five very different breeds of dog. Pedigree dogs come in lots of different varieties. They may be different colours and ...