Chordates, members of the animal phylum Chordata, which includes all mammals, birds, amphibians, reptiles, and fish. There are about 45,000 species of chordates. They are classified in four subphyla, the largest of which contains the vertebrates. All chordates share three basic characteristics. The first characteristic is a single dorsal nerve cord, which in mammals takes the form of the brain and spinal cord. The second is a flexible rod of cells called a notochord, which in vertebrates takes the form of the backbone. The third is the presence of gill slits at some stage during the development of the animal. All chordates have bilateral symmetry.
Copperhead is a poisonous snake related to the rattlesnake and the water moccasin. It is named for the coppery-red color of its head.
Nature can be a pretty cruel place. Out in the wild, it's either kill or be killed. But in the spirit of self-preservation, will a mama bird really abandon its young at the slightest sign of human interference? Let's check the facts.