Mallard

Identification

The drake is unmistakable: a glossy bottle-green head, a thin white collar ring, a chestnut-brown breast and a grey body that ends in a black rear with curled tail feathers. The female is a mottled brown bird with an orange-and-black bill and a blue speculum edged in white — and she is the one doing the loud quacking. Eclipse males in late summer look like females but keep a plain yellowish bill and a darker crown.

Mallards are dabblers, tipping forward rather than diving, so their tails point skyward while they filter seeds, pondweed and insect larvae out of shallow water. They also graze on grass, take grain and scraps in parks, and follow ploughs for spilled seed. Pair bonds form on the wintering grounds, and the female alone incubates eight to thirteen eggs in a down-lined nest that is often well away from the water's edge.

Look for them on almost any lowland water body, but the easiest views come in city parks and on village ponds where the birds are used to people. Numbers peak in autumn and winter, when northern breeders move south and join mixed flocks with other dabblers. Scan those flocks carefully — hybrids with other Anas ducks show a greenish head on a female-like body.

Feeding and annual cycle

Mallards are dabblers, not divers. Rather than chasing food underwater they tip forward, tail in the air, and filter seeds, pondweed and insect larvae out of the shallows with the comb-like lamellae along the bill. They also graze on grass, take grain, and will follow a plough for spilled seed, which is why a wet field can hold dozens at once.

Drakes are flightless for a few weeks in late summer while the wing feathers moult, and it is during this window that they moult into eclipse plumage and skulk in reedbeds with the females. Pair bonds form on the wintering grounds, but the female alone builds the down-lined nest, incubates the clutch, and leads the ducklings to water within a day of hatching.

Voice and how to use it

The classic loud quack belongs to the female: a series of descending notes that fades out at the end, used in alarm and as a contact call to gather the brood. The drake is much quieter, giving a soft, raspy single note and, in courtship, a quiet whistle and head-bobbing display rather than a quack.

Because mallards are noisy, sound is a practical census tool. Counting the quacks of a female and the softer notes of drakes along a pond edge is often easier than trying to separate birds in eclipse or hybrid plumage, and the calls carry well on still mornings.

Confusion risks

In late summer, eclipse drakes look like females but keep a plain yellowish bill and a darker, more uniform crown, and many show traces of the grey body or a hint of the green head. Hybrids with other Anas ducks are frequent and can combine a greenish head with a female-like body, a pale or oddly patterned bill, or an unmarked speculum.

The blue speculum bordered with white bars on both sides is the steadiest mark on any female or juvenile Mallard, and separating them from female Gadwall, Pintail and Shoveler usually comes down to bill shape, head profile and that wing pattern.

Where and when to look

Any lowland water will do: park lakes, village ponds, canals, flooded gravel pits, sewage works and the quiet corners of rivers. The easiest and closest views are in towns, where birds are used to people, and a midwinter count of a park pond in a cold snap can be surprisingly large as birds move in from frozen farmland.

Numbers peak from October to February when northern breeders arrive and mix with residents. Early morning is the best time for watching undisturbed behaviour, since after lunch most urban mallards have been fed and are asleep on the bank. Scan flocks carefully for the odd bird out: that is where hybrids and rarer dabblers hide.

Fieldcraft and conservation notes

Feeding bread is the most common mistake people make. Bread has little nutritional value for a duck, fouls the water as it decays, and attracts rats; if you want to feed birds, grain, oats, peas or chopped greens in small quantities are the usual recommendation. Keep children back from the water's edge in spring, and never handle a sick or dead wild bird - report it to the relevant wildlife authority instead.

Mallards are the most numerous duck in the northern hemisphere and their adaptability makes them the genetic reservoir, and sometimes the problem, for rarer relatives. Where Mallards have been introduced alongside localised species, interbreeding is treated as a real conservation threat, which is one reason the species is not always welcomed by wildfowl managers.