Among animals, few life cycles are as dramatic as that of the octopus. After a single reproductive event, many females enter ...

There are two basic life-cycle patterns among animals. Many animals have complex life cycles with two or more very distinct stages; metamorphosis is the usual term for the often-radical changes that ...

Some animals reproduce only once before dying. This life strategy, called semelparity, sees organisms channel all energy into reproduction. Mechanisms include stress hormone overload, sexual ...

Students explore and compare chicken and butterfly life cycles. In this lesson, students explore and compare chicken and butterfly life cycles through the development of scientific drawings or models.