Male monkeys have large throats and specialized, shell-like vocal chambers that help to turn up the volume on their distinctive call ... Other species of howler monkey may be critically endangered ...

An ongoing study of the cause of death of howler monkeys on Barro Colorado has identified the howler monkey bot fly Cuterebra baeri as the single most important factor. Very young monkeys are the ...

According to the fifth census of Mantled Howler Monkeys, Alouatta palliata, on Barro Colorado Island in Panama, monkey numbers have changed little since the late 1970s. Disclaimer: AAAS and ...

At least 83 of the midsize primates, who are known for their roaring vocal calls, were found dead in ... jungle-covered state of Tabasco, the howler monkey is a cherished, emblematic species ...