The state has many sanctuaries, national parks and zoological parks, such as Coringa, Krishna Wildlife Sanctuary, Nagarjunsagar-Srisailam Tiger Reserve, Kambalakonda Wildlife Sanctuary, Sri Venkateswara Zoological Park and Indira Gandhi Zoological Park. Atapaka Bird Sanctuary, Nelapattu Bird Sanctuary, Telineelapuram and Telukunchi Bird Sanctuaries and Pulicat Lake Bird Sanctuary attract many migratory birds. The state possesses some rare and endemic plants like "Cycas beddomei", "Pterocarpus santalinus", "Terminalia pallida", "Syzygium alternifolium", "Shorea talura", "Shorea tumburgia", "Psilotum nudum", etc. The diversity of fauna includes tigers, panthers, hyenas, black bucks, cheetals, sambars, sea turtles and a number of birds and reptiles. The estuaries of the Godavari and Krishna rivers support rich mangrove forests with fishing cats and otters as keystone species.