For a small number of animals, reproduction marks a biological endpoint rather than a stage in an ongoing life cycle. Death follows mating with such consistency that it can be predicted within a ...

For some animals, reproduction comes at the ultimate cost—their own lives. While this may seem extreme, it's a natural strategy to maximize reproductive success. These species invest everything into ...

Relationships can be complicated, especially in the wild. There are dozens of ways for creatures to couple up, whether they’re microscopic bacteria or massive jungle mammals. But as is true for human, ...