Sharks have no swim bladder and must swim perpetually to keep from sinking to the bottom. There are more than 300 living species of sharks, taxonomically grouped into 13 to 22 families according to different authorities. It is now found mainly in parts of Africa south of the Sahara. A few hundred lions, constituting an Asiatic race, live under strict protection in the Gir Forest National Park in Gujarat state, India. The preferred habitats of lions are grassy plains and open savanna.
Lions proclaim their territory by roaring and by scent marking.
The lion's well-known roar is generally uttered in the evening before a night's hunting and again before getting up at dawn. Males also proclaim their presence by urinating on bushes, trees, or simply on the ground, leaving pungent scent markings in the process. Defecation and rubbing against bushes leave other scent markings.