Notochord, a flexible supporting rod along the back of an animal. It is present in all chordate animals at some stage in their development. A primitive chordate retains it throughout life. In higher vertebrate animals, the notochord is replaced before birth by a backbone.
There's Paddington Bear, Winnie the Pooh, Rupert Bear and many more. While kids may like to snuggle up with their teddy bear, real bears are wild creatures that can be very dangerous. There are many different kinds of bears, each with different characteristics and habits. Take this quiz to learn more about bears.
Many animal species are designed with built-in protection in the form of their skin color. There are also some animals that have developed appendages that mimic the appearance of leaves and plant branches. Learn about 11 animals that use camouflage.