Description
The long-tailed planigale has an extraordinary head shape. All planigales have a flattened head, much broader than it is deep. This smallest planigale takes that trend to an extreme: at just 3 to 4 mm (0.12 to 0.16 in) from top to bottom, the skull is one-fifth as deep as it is wide. The purpose, it seems, is to allow it to squeeze into the tiniest of soil cracks; to find its prey, perhaps to avoid predators, or more probably for both reasons. The clays and blacksoils of the Top End typically develop deep cracks as they dry after the monsoonal summer rains, which persist right through the eight-month dry season until the wet begins again, usually producing floods that force small creatures like the Long-tailed Planigale to seek refuge on high ground.
The head shape aside (which in any case is not obvious from all angles), the long-tailed planigale looks rather like a very small mouse with a long, bare tail. The muzzle is pointed, the fur a nondescript and variable brown, the hindlegs a little bigger than the forelegs, allowing it to stand semi-crouched on hindlegs and tail, rather like a tiny squirrel.
Combined head-body length varies from 55 to 65 mm, averaging 59 mm in both sexes, the tail length is similar. Average male weight is 4.2 grams, 4.3 grams for females; a really large specimen can reach almost 6 grams.
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