A COOING PAIR THE PASSENGER PIGEON AND THE MOURNING DOVE "You all know the Pigeons that are kept about stables and barnyards.

You have often seen them walking with dainty steps to pick up their food, and have heard the soft crooning 'coo-oo' they give when talking to each other.

They all belong to the Birds that Coo.

Their food is taken into the crop, which can be plainly seen when it is quite full.

These birds feed their young in the same way Hummingbirds and Flickers do; for they give the little ones softened food from the crop, mixed with a sort of milky fluid that also comes from the crop.