Animal behaviour. It is about a member of a group who will watch out for the predators and give a warning if needed. Cooperative breeding species mostly show this behaviour.

SENTINEL BEHAVIOR: "Meerkats show a lot of sentinel behaviour by having watchers around them all the time."
Cite this page: N., Pam M.S., "SENTINEL BEHAVIOR," in, April 13, 2013, (accessed September 23, 2021).