Wish I could remember who suggested a "nocturne of bats" on AWAD. In trying to find some more intesting photographs of bats, I came across this list with one family name having the word vesper in it, which is nice:

Information on Amazonian Bats (arranged by family):

Rhynchonycteris Naso

- small
- live in rocky crevices, caves, trees, hollow logs
- have more exposed roosts than most other bat families
- some species live in year-round stable harems, with 2-8 females per male

Noctilionidae

- feed on insects, some species on fish and frogs
- roost near water, in hollow trees, and in deep cracks in rocks
- the Noctilio leporinus species can swim

Mormoopidae

- small - medium size
- insectivorous
- sometimes roost in large colonies, sometimes exclusively in caves
- Pteronotus parnellii species eats only moths, butterflies, and beetles

Natalidae

- small
- often roost in caves or mines
- have social groups that range in size from very large to less than ten
- eat exclusively small insects

Furipteridae

- very small
- insectivorous (mainly butterflies and moths)
- live in colonies of about 100 to 150 individuals, sometimes more than 300
- live in mainly in caves, occasionally in moist areas or logs

Thyropteriae

- small
- have suction cups on wrists and ankles
- roost head up, inside tubes formed as young banana/heliconia leaves unfurl
- Thyroptera discifera species is insectivorous
- Thyroptera tricolor species
- predators don't usually notice this species
- consumes 1 gram of insects a night

Vespertilionidae

- largest family of bats (in number) with 318 species
- huge variation in characteristics
- mainly roost in caves

Molossidae

- small to moderately large
- insectivorous, catch prey on wing

Retrieved from:

http://web.mit.edu/12.000/www/m2006/teams/r4/batsindicator.html