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 ...

But what at the cash register seems inexpensive in fact costs dearly to farmed animals, the environment, rural and traditional farming, human health, and food quality and safety. Over 9 billion ...

German pig skulls changed significantly due to selective breeding. Scientists found shorter snouts and flatter foreheads in ...