Anhingidae

Lore & Background

Darters are large birds with sexually dimorphic plumage: males have black and dark-brown feathers with a short crest, while females are paler, especially on the neck and underparts. They have completely webbed feet, serrated bills, and external nostrils that can be closed underwater. Their plumage is wettable, allowing them to dive with low buoyancy, and they have a reduced brood patch, instead covering eggs with their webbed feet. During breeding, their gular sac and facial skin change color, and the iris shifts seasonally between yellow or orange during breeding and brown at other times.

These birds inhabit freshwater lakes, rivers, marshes, and swamps, rarely venturing into brackish estuaries. Most are sedentary, though some migrate from cooler regions. They fly by soaring and gliding, walk with a high-stepped gait, and gather in flocks of up to about 100, often associating with storks, herons, or ibises. They are highly territorial on the nest, stabbing intruders with their long necks and bills. Their diet consists mainly of mid-sized fish, which they impale with a rapid darting motion of the neck, then toss and swallow head-first.

Breeding is seasonal in northern areas, peaking in March/April, but can occur year-round elsewhere. Pairs are monogamous for a season, building nests of twigs in trees or reeds near water. Clutches contain two to six pale green eggs, incubated for 25–30 days. Young are semi-altricial, downy and able to move somewhat soon after hatching, fed by regurgitation, and fledge after about two weeks of post-fledging care. Sexual maturity is reached at about two years, with a typical lifespan of around nine years and a maximum of about 16.

Reader's Guide

The Anhingidae family holds significance as a distinct group of waterbirds adapted for underwater hunting through a unique combination of physical traits: wettable plumage, dense bones, and a specialized neck hinge that allows them to spear fish. Their name 'anhinga' derives from the Tupi language, referring to a malevolent forest spirit, reflecting cultural perceptions. Ecologically, they occupy tropical freshwater habitats and are sensitive to human disturbances such as habitat destruction, egg collection, and pesticide use, as seen in the Near Threatened status of the Oriental darter. Their legacy includes traditional use by some nomadic groups in Assam and Bengal, who trained darters for fishing, a practice now endangered as nomads settle. The family's evolutionary relationship to cormorants and other Sulae birds underscores their place in avian diversity. Despite being edible, their fishy taste limits their appeal as food, though eggs are sometimes collected. Overall, darters exemplify specialized adaptation and cultural interaction, with conservation efforts aiding recovery in some regions.

Did You Know?

• Darters impale fish with their sharply pointed, serrated bill and then toss the prey into the air to swallow it head-first.
• The name 'anhinga' comes from the Tupi language, referring to a malevolent demonic forest spirit, often translated as 'devil bird' or 'snake bird.'
• Darters have a reduced brood patch and instead cover their eggs with their large webbed feet to provide warmth.
• Some nomads in Assam and Bengal have traditionally trained tame darters for fishing, a practice now in danger of being lost.