A novel analysis suggests more than 3,500 animal species are threatened by climate change and also sheds light on huge gaps in fully understanding the risk to the animal kingdom.

Mammals also have more developed brains than other types of animals. Humans are mammals. This question often gets confusing because some sharks are "viviparous," meaning they give birth to live young.

Save guides, add subjects and pick up where you left off with your BBC account. Animals can be put into groups based on the types of food they eat. Some animals called carnivores only eat meat.

Though bony endoskeletons are the best known, the animal kingdom features three other types of skeleton: exoskeletons, cartilaginous endoskeletons, and hydrostatic skeletons. Endoskeletons have ...