The families of land birds are further grouped into birds of prey, omnivorous birds, insectivorous birds, and granivorous birds, while the families of water birds are simply listed, with what seemed to be related families, such as " Of the Anas " ( ducks ) and " Of the Mergus " ( sawbill ducks ), side by side.
12.
The insectivorous weaver bird " Ploceus bicolor " can also learn to associate four feeding rooms with four feeding times, and it maintains the correct spatio-temporal pattern even when one of the rooms is blocked on test days ( the bird then waits for the next feeding time and visits the appropriate room for that time ); however, room blocking disrupts the spatio-temporal pattern in the granivorous weaver bird " Euplectes hordaceus ", which suggests that time-place learning may be stronger in species for which food in nature is more likely to vary spatio-temporally ( as is the case for insects, as opposed to grain ).
