Some Lungfish are able to survive when their pools dry up! they can burrowing into the mud and seal themselves in a mucous-lined burrow, to help keep moist. During this time, they breathe air through their swim bladder instead of through their gill. These fish will even drown if they are kept underwater and not allowed to breathe air!
Fossilized lungfish burrows have been found in rocks as old as the Permian peiriod.
There are seven families of fossilized lungfish known, only two survived into the Triassic and those two are still alive today! |
