Do Crab live in the desert?
There are crab Spiders (see first wikipedia article in related
links) and there are spider crabs (see second wiki article for the
most commonly referred to spider crab, the huge Japanese kind).
Crab spiders are a family (as in Kingdom, Phylum, Class, Order,
Family, Genus, Species), and thus a rather general type of spiders,
that are very wide spread throughout the world. There a genus of
spider sometimes called a crab spider that is very poisonous, and
they live in the deserts of Africa (see third wiki article).