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Some slime mold we found in the woods, with tiny rodent footprints on it!

Some slime mold we found in the woods, with tiny rodent footprints on it!

Parasite host-specificity

Most of the world’s parasitic organisms are highly limited in the number of host species they can feed upon; often only very similar animals found in the same range, and more commonly just one single species.

This awesome post on daily parasite details an experiment in which a species of flea, known to infest several types of rodent, was lab-reared on two types of host to see if each population would grow more specialized.

It only took six generations before the fleas from one host had a much, much harder time surviving on the other!

Nutria and soft-shelled turtle photographed by xor

Nutria and soft-shelled turtle photographed by xor