Illacme plenipes almost merits the name millipede, with its 750 legs – and it can squeeze silk out of the hairs on its back.
There's a problem with the names of things: they're often wrong. Peanuts are not nuts, catgut is generally made from sheep, shooting stars are actually rocks, and any country that calls itself a Democratic Republic is almost certainly a totalitarian dictatorship. The same is true of those notorious little scuttlers, the millipedes and centipedes.
Some centipedes have well over 100 legs – Gonibregmatus plurimipes has 382 – so we should really call them multicentipedes. And no known millipede has 1000 legs: it's rare for them to have more than a few hundred. One species, however, comes close. Illacme plenipes can have up to 750 legs, more than any other animal. We know little about it, but as we find out more, it seems its overabundance of lower limbs is the least of its peculiarities.
I. plenipes was thought to be extinct, as it had not been seen since 1928. But then it was rediscovered in 2005, by graduate student Paul Marek, now at the University of Arizona in Tucson. Marek found it lurking underground in a single ravine in San Benito County, California.
Animals don't evolve a multitude of legs just to amuse us: there's presumably some advantage. Marek says I. plenipes's legs may help it to burrow underground, where it spends all its time. Or they could be a sort of accident, a consequence of I. plenipes evolving another anatomical advantage: its digestive tract is spiral-shaped and thus has a high surface area, allowing it to absorb more water and nutrients from its food before excreting it. Marek says I. plenipes may have evolved a very long gut to cope with a sparse diet – with the legs as an incidental result.