For the most part you'd be right, but the Honduran White Bat is a little different.
They come from parts of Central America and are absolutely tiny! Just 4 or 5 cm (1.5 or 2 in) long. Their nose and ears are yellow and the rest of the body is covered in fuzzy, white fur. They're nocturnal, spending the nights eating fruit and resting through the day.
First, they select a great, big leaf a few feet off the floor. Then they cut through the veins that branch out either side of the main central vein, called the midrib. This causes the whole leaf to almost fold in half under its own weight.
The Honduran White Bats now have a nice roof over their head, although they roost upside down so I guess it's a roof over their feet. There are no walls so hopefully the neighbours aren't too nosy, especially since each tent will house 1 male and his harem of around 5 females.
But why are they white? The answer may well be because sunlight filters through the leaf and casts the bats in a green hue, which provides them with some great camouflage. So they're white because it helps them to become green! I guess the only alternative was green paint?