There lives in America such a small fish - marble rivulus (Rivulus marmoratus Poey, alias Kryptolebias marmoratus), dwelling in mangrove bogs. It was known and earlier that rivulus is capable to live some time outside of water, but biologists with surprise have found out that the fish can spend in rotten branches and in the fallen trunks of trees several months, outliving droughts or other adverse conditions.
Researchers have found out hundreds of rivuluses, disappearing in rotten trunks. After pools in which small fishes were living, have dried up, rivuluses moved (they can move overland) in the fallen trees quite often using for habitation the courses laid by insects. In unusual conditions fishes put up with narrowness and suffer a lot of neighbors though in their usual life, in water, zealously preserve their territory.
It is interesting, where people will be hidden when oil will end and the electricity will be cut off. Shall we leave in caves Again?