Maybe the animals most present in all the three Thief chapters, the crickets are present (as sound) in almost all the grass field, bushes and trees along the games. Sometime is also heard some kind of cicala call in the first two chapters, but it's not a normal cicala call, it's something slightly modified from the original, as if it suggests a different kind of animal from the cicala of our world.

The use of the crickets suggests that the missions can be placed between the hot seasons (spring, summer and early autumn), unless the Thief crickets were different from our species.