Yes they can.
A plump of moorhens
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Of course they can. Birds such as swans, ducks, geese, gulls, moorhens all have webbed feet and all are capable of flying huge distances when migrating in the winter and spring
owls and other dusky moorhens
Moorhens typically lay between 6 to 12 eggs per clutch. The eggs are usually speckled and are incubated for about 19 to 22 days before hatching. After hatching, the chicks are precocial, meaning they can leave the nest shortly after and are able to swim. Moorhens may produce several clutches in a breeding season.
A group of moorhens is commonly referred to as a "plump." These birds are known for their distinctive plumage and are often found in wetlands and around water bodies. They are social animals and can often be seen foraging together.
Marion Petrie has written: 'Winter flocking in moorhens'
The answer to your question depends upon which species of moorhen you are asking about.The Common Moorhen is distributed almost worldwide. Other species of moorhen live in many parts of the world including Australia, Siberia, Africa, South America, Tasmania, Indonesia and New Zealand. This list includes most of the places moorhens can be found but it is not exhaustive.
Geese, fish, seagulls, rats, other water birds (coots, moorhens etc.)
Creatures with feathers and webbed feet include ducks, geese and other waterfowl such as the Australian moorhens and swamp hens.
Dusky moorhens prefer wet areas because they rely on wetlands for nesting, feeding, and refuge from predators. Wet places provide ample food sources like aquatic plants, insects, and small fish, making them ideal habitats for these birds. Additionally, the presence of water offers protection and helps them camouflage from predators.
The collective noun plump is used for a plump of ducks (in flight), a plump of geese (on water), a plump of waterfowl, a plump of wildfowl, a plump of moorhens, and a plump of woodcocks.