http://www.britannica.com/EBchecked/topic/55655/bat/51407/Roosting?anchor=ref67226
Bats choose a variety of diurnal roosts, although the roost requirements of many bats, which are rather precise in terms of light, temperature, and humidity, limit their distribution. Each species favours a particular kind of roost, though this varies with sex, season, and reproductive activity. Many bats prefer isolated or secure roosts—caves, crevices in cliff faces, the interstices of boulder heaps, tree hollows, animal burrows, culverts, abandoned buildings, portions of buildings inaccessible to humans or infrequently accessed by them (i.e., a roof, attic, or hollow wall), or the hollow core of bamboo stalks.
http://imagecache5.art.com/p/LRG/30/3028/PGKBF00Z/randy-olson-fruit-bats-roosting-in-a-tree.jpg
By themselves the shapes a bat forms isn't very significant until they form up side by side. Together they roost without leaving a gap, no matter how jagged the surface is or how much a surface can protrude out.
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