Flocker 1.1 is a software designed to analyse group size data differentiating between outsiders' view (group size) versus insiders' view (crowding) measures.
Theoretical background, examples, and description of statistical procedures are found in
Reiczigel et al. 2008. Measures of sociality: two different views of group size, Animal Behaviour, 75, 715-721.
The software is free to use and distribute for scientific and educational purposes. Please cite the above article as a theoretical background of the statistical procedures.