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.
Swallow is a large family of insect-eating birds. Swallows are found in almost all parts of the world and are migratory.
A good portion of a giraffe's height comes from its statuesque neck. But how do these lanky creatures get their necks in such pretzel-like positions?