Cruel Duck

A few specialized species such as the smew, goosander, and the mergansers are adapted to catch and swallow large fish.
The others have the characteristic wide flat beak designed for dredging-type jobs such as pulling up waterweed, pulling worms and small molluscs out of mud, searching for insect larvae, and bulk jobs such as holding and turning headfirst and swallowing a squirming frog. To avoid injury when digging into sediment it has no cere. but the nostrils come out through hard horn.
• Breeding
The ducks are generally monogamous, although these bonds generally last a single year only. Larger species and the more sedentary species (like fast river specialists) tend to have pair-bonds that last numerous years. Most duck species breed once a year, choosing to do so in favourable conditions (spring/summer or wet seasons). Ducks also tend to make a nest before breeding.