The agouti is a rodent with the appearance of an enormous, tailless squirrel. Agouti and their cousin, paca, are both relatives of the guinea pig. Paca are nocturnal and are popular targets among hunters in Costa Rica. They are quite easy to capture due to the strong musk they secrete from their anal glands while marking their territories. They will also simply run in circles rather than flee from their territory while being chased. However, paca will find some success in hiding underwater. When alarmed, it may emit a high-pitched bark.