I measured prey capturing success (=proportion of successful captures divided by the total number of prey captured) in four fish species (species 1: n=19, species 2: n=18, species 3: n=4, species 4: n=3) and would like to compare the prey capturing success between the four species. However, as there might be an individual effect within species (some fish might be better due to slight differences in morphology) I do not think one can simple sum everything up and compare four values (proportions). Therefore I want to know if it is possible to compare multiple proportions between the four species. Note that the proportions do not show a normal distribution within the species.
Many thanks in advance!