Reciprocal migration of animals between geographic areas. Such exchanges are usually due to the opening of land bridges between adjacent regions formerly separated by physical or ecologicalbarriers.
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land bridge (... routes for the great faunal exchanges of the past.)
gas exchange (During respiration, process of osmosis of air-like materials across a semipermeable membrane. ...)
faunal break (... a different fauna, or to faunal migration, or to extinction.)