This is the largest boa that I saw in Santa Rosa, around 12 feet long. Look at that massive head!

Predation Risk

Many animals can accurately judge fluctuations in predation risk and make behavioral adjustments to reduce their vulnerability to predators. As part of my PhD research, I used alarm-call responses by the arboreal monkey Cebus capucinus to characterize perceived predation risk for three distinct predator guilds in a heterogeneous landscape. High-risk areas comprised more mature, evergreen forest. The monkeys perceived reduced risk in the high and middle forest layers, and they loosely adjusted vigilance levels to small-scale spatial variation in perceived risk.

Campos and Fedigan (2014) Behav Ecol