Craniate with well-defined heads, thus excluding members of the chordate subphyla Tunicata (tunicates) and Cephalochordata (lancelets), but including Myxini, which have cartilaginous skulls and tooth-like structures composed of keratin. Craniata also includes all lampreys and armoured jawless fishes, armoured fish, sharks, skates, and rays, and teleostomians: spiny sharks, bony fish, lissamphibians, temnospondyls and protoreptiles, sauropsids and mammals. The craniate head consists of a brain, sense organs, including eyes, and a skull. In addition to distinct crania (sing. "cranium"), craniates possess many derived characteristics, which have allowed for more complexity to follow. Molecular-genetic analysis of craniates reveals that, compared to less complex
Really Wild Animals to do to survive in North America (I Gotta Be Wild); the second is about the places animals call home (Look Who's Moving In); the third focuses on difficulties in getting what animals want (To Get What You Want); and the fourth is about the winter season (Winter). The immense continent of Asia is explored. With such a large area to cover, this episode jumps from one place to the next. Examples include the Indonesian islands, the Arabian Peninsula, Indian jungles, and Chinese mountains. Some of the featured animals in these locations are the sea snake, the Arabian oryx, the