Small monkey groups may win territorial disputes against larger groups because some members of the larger, invading groups avoid aggressive encounters.

An unusual signal detected results from waves in Lake Gatun, the reservoir that forms the Panama Canal channel.

The fifth Howler Monkey census at the Smithsonian's Barro Colorado Island research station in Panama, organized by Katie Milton, professor in the department of Environmental Science, Policy & Management at the University of California, Berkeley, revealed that monkey numbers have not changed significantly since the first census 33 years ago.

By Moreno, Ricardo S; Kays, Roland W; Samudio, Rafael Jr We used fecal analyses to document the diet of ocelots (Leopardus pardalis) and puma (Puma concolor) at 2 sites in central Panama.