In addition to the endangered Delacour's langur, Cuc Phuong is home to many other rare species, including a fish called niec hang ( Silurus cucphuongensis ) that lives in cave streams and a palm civet, roughly a cross between a ferret and a raccoon.
12.
"' Freshwater molluscs "'are those members of the Phylum Mollusca which live in freshwater habitats, both lotic ( flowing water ) such as rivers, streams, canals, springs, and underground cave streams ( stygobite species ) and lentic ( still water ) such as lakes, ponds ( including temporary or vernal ponds ), and ditches.
13.
Researchers like Borowsky find that fish which have wandered into caves and bred there tend to undergo a process of convergent evolution : They lose their eyes and their skin colour, their sensory pits increase, and after a long time they lose their diurnal rhythm-- the body's natural sense of knowing when it is day and night-- and even their fear of predators, which are few and far between in cave streams.
