A dog flea, above, and a cat flea, below.
Fleas and lice are, broadly, host specific. For example, there are Cat fleas (Ctenocephalides felis), Dog fleas (Ctenocephalides canis), Human fleas (Pulex irritans), Northern rat fleas, and Oriental rat fleas (Xenopsylla cheopis). By the same token, there are lice that live on specific species of birds, fur-bearing mammals, monotremes, mangolins, bats, and even whales.
Fleas and lice are, broadly, host specific. For example, there are Cat fleas (Ctenocephalides felis), Dog fleas (Ctenocephalides canis), Human fleas (Pulex irritans), Northern rat fleas, and Oriental rat fleas (Xenopsylla cheopis). By the same token, there are lice that live on specific species of birds, fur-bearing mammals, monotremes, mangolins, bats, and even whales.
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