Radioactive!  Ok not really, but they are UV reactive which means the will fluoresce under black light. Two different fruit bats and a wee birdy.  These guys are tiny, the smaller fruit bat being less than 1".  Both the bats are cast in two pieces with separate jaws so they can bite things.

These were a challenge to cast, there is more resin in the pour spouts / vents than the finished piece and I had to crank the PSI up to near danger levels to get the teeth to behave.  Not to mention the original specimens are about as durable as soggy tissue paper.