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 ...

Female snakes can produce their offspring in several different ways. Many people assume that all snakes lay eggs, but the ...

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 ...

The unusual life cycle of ants reflects their social behavior, with some individuals foregoing reproduction to tend to the ...

Scientists have pinpointed the 'pace' and 'shape' of life as the two key elements in animal life cycles that affect how different species get by in the world. The findings have important implications ...

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 ...

In an interactive project that offers first-graders an up-close look at the birth and life cycle of animals, one teacher is hatching chickens in her class to educate her students. And it started when ...

Analysis of the DNA and proteins of a range of animals has revealed that sperm’s molecular toolkit arose in our single-celled ...

From an insect known for its one-day life as an adult to a tiny rodent that might make it to a year and a half, Pennsylvania is home to some of the shortest-lived animals on Earth. We often hear that ...

Mass extinctions of land-dwelling animals--including amphibians, reptiles, mammals, and birds -- follow a cycle of about 27 million years, coinciding with previously reported mass extinctions of ocean ...