Given groups of six and nine , they could pick , or peck , the images in the right order .
在六个和九个物体一组的分组中,它们能够按正确的顺序选出或啄出图片。
Territorial species are more spaced out , and species with peck orders show less overt aggression .
领域性物种拥有更开阔的空间,而带有啄食次序的物种其攻击性则表现得不那么明显。
Many people believe that chickens peck the ground search for a magic needle .
许多人认为,鸡啄地面搜寻魔术针。
In some of the grainy pictures , scrubby and deserted patches of creosote and mesquite sway in a gentle wind ; in others , herons peck at fish in the shallow trickle of the rio grande .
Maximum commercial efficiency requires that enormous poultry populations be confined in unnaturally close quarters , under which conditions many birds go crazy and peck one another to death .