Florida Scrub Jays are an excellent example of a cooperative-breeding species. This book provides data on fecundity, survivorship, relatedness, and dispersal to establish the demographic milieu and to address questions arising out of observed helping behavior - whom, how, when, and why the helpers help. "This is an important contribution to population biology. It will be of interest not only to workers in the field, but also as a readable introduction to one of the central topics in ornithology today. For the general naturalist . . . it's a well-written, thoughtful account of a fascinating subject."---Clive E. Goodwin, Canadian Field Naturalist