The warning to their chicks sounds almost like a bark from a small dog. If the danger closes in, the bark is repeated, and when very close, the warning is three quick barks. If a chick is "grounded", the bird makes itself appear bigger to intimidate the threat. If other adult birds are present, they will help in the same way. For instance, a person with a dog (or someone who chases the chick) may be attacked by many adult birds, even if just one chick is in danger.