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 ...

Researchers uncover for the first time the mechanism that likely explains how embryos form either a larva or a miniature version of the adult. For over 100 years, biologists have wondered why animals ...

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.

From tadpole to frog caterpillar to butterfly and pup to wolf children will learn about the life cycles of animals the different stages of development and the average life spans of a variety of ...

Cats are one of the most popular house pets to own around the world. Independent, cuddly, and vocal, most house cats bring joy and entertainment to the average family. But how long do house cats live, ...

Head lice are small, wingless insects that live in human hair. Their scientific name is Pediculus humanus capitis, and they have been a human pest for thousands of years. Their full life cycle, from ...

For over 100 years, biologists have wondered why animals display different types of life cycles. Some species, like us humans and most vertebrates, develop directly into a fully formed—yet ...