With all the water that floods into cave systems with heavy rains occur, sticks, leaves, frogs, and other things are swept in an d deposited in the cavern system. Frogs and other misplaced animals are not adapted to survive in these harsh environments and will perish. Other animals like snakes or birds will often make a nest near the entrance of a cave, but this is usually only t emporary and they will rarely mate in the cave. In a sense man is the most obvious trogloxene or cave- alien. Troglophiles are organisms that seek out caves for living quarters.
Bears often hibernate over the winter in caves for solitude.
Of course the most famous troglophiles, which means cave-l oving, are the some 2,000 species of bats that hang from the ceiling in caves then venture out at night for their dinner. Winged bats, Cleiroptera , are the most diverse mammals in the world. Desdemondas rotondus is the famed vampire bat of South America. With two razor sharp teeth, it slices the skin of a sleeping donor. Besides transmitting the rabies virus to its prey, the bat is hardly dangerous because it never can take enough blood to kill its victim.