“normal” beaks (examples shown of a petrel and a gull) and a bird with a tactile bill-tip organ (a tinamou, close relative of ostriches and emus and which has an ancestral bill-tip organ ...

It is recognizable by its dark-brown face, long, white neck, and of course, a white backside that can only be seen when the bird is in flight ... as its beak is unable to rip through tough ...