one is the grandaddy being up to 6mm long, but luckily only found on
moles, shrews and small rodents.
Generally fleas that live on diurnal
hosts have well-developed eyes; species that parasitize subterranean
hosts (e.g., moles or nocturnal animals like bats) have poorly developed
eyes or none at all. The most impressive adaptations are highly developed
jumping legs and the powerful muscles that control them.
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