Counting bat clusters the easy way

I use ImageJ plus a plugin called Cell Counter for counting large amounts of animals from photos. You can use 8 different counter types simultaneously, nice for mixed species clusters.

Freely available at:
ImageJ: http://rsb.info.nih.gov/ij/

And plugin: http://rsb.info.nih.gov/ij/plugins/cell-counter.html

Example: Myotis myotis

Counting Myotis myotis clusters from photos.