All animals have a life cycle, but they can be very varied and different. As part of their life cycle all animals, including humans who are animals too, have offspring which grow into adults. Humans ...

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 ...

nWhat kind of animal has the most species on Earth? Is it fish? Is it birds? The answer is 'insects.' To date, about 30,000 species of fish, 9,000 species of birds, 5,000 species of mammals, 6,000 ...

Researchers have just defined the reproduction cycle of the Spanish Lynx. Experts have used a method of indirect analysis based on determining the sexual hormones concentration -- estrogen, ...

Sea squirt, a tiny sac-like sea creature, keeps replacing its brain throughout its life cycle. This marine animal belongs to ...

Learn how scientists at the Smithsonian Conservation Biology Institute can help zoo caretakers learn about the reproductive status of their animals by using frozen poop samples.

Scientists have discovered a marine animal that can reverse its aging process. The comb jelly, a jellyfish-like creature, can revert to a younger state when stressed. This discovery challenges ...