Greater Adjutant

Overview

The Greater Adjutant is a massive stork closely related to the African Marabou Stork, sharing a similar bald head, heavy bill, and scavenging habits, but now one of the rarest storks in the world, confined mainly to a few sites in northeastern India and Cambodia. Its dark grey upperparts, pale underparts, bald head, and pendulous throat pouch give it a similarly somber, vulture-like appearance to its African counterpart.

• Very large stork with a bald, wrinkled head and neck
• Dark grey upperparts contrasting with pale grey to whitish underparts
• Massive, heavy bill
• Pale, inflatable throat pouch hanging from the front of the neck

Feather Identification

Greater Adjutant feathers are large and substantial, matching the bird's great size, with dark grey upperpart feathers and paler grey to whitish underpart feathers.

• Upperpart feathers: dark slate-grey, sometimes with a subtle greenish gloss
• Underpart feathers: pale grey to whitish
• Undertail coverts: soft, fluffy, and pale, similar in texture to the decorative plumes of the Marabou Stork
• Flight feathers: broad and dark, adapted for soaring on thermals
• Vs. Marabou Stork: very similar in pattern; range is the most reliable distinguishing factor, since the two species do not naturally overlap
• Vs. Lesser Adjutant: Greater Adjutant feathers are noticeably larger, matching its bulkier body size

Plumage Details

Adults show dark grey upperparts and wings with pale grey to whitish underparts, a bald head and neck with patches of pink, yellow, and grey bare skin, and a pale pendulous throat pouch used in display. Juveniles have more feathering on the head and a smaller, less developed pouch, with generally duller plumage that matures over several years. Molt is gradual, without a sharply defined seasonal pattern, similar to other large storks.

Habitat & Range

Greater Adjutants historically ranged across South and Southeast Asia but have suffered dramatic population declines due to habitat loss and hunting, surviving today mainly in scattered wetland and floodplain areas of northeastern India, with a very small population in Cambodia. It uses wetlands, rivers, and rubbish dumps, and is largely resident within its remaining strongholds, with limited seasonal movements.

Behavior & Field Notes

Greater Adjutants scavenge at carcasses and refuse sites much like the Marabou Stork, while also hunting fish, amphibians, and other prey in wetlands. Conservation efforts in parts of its Indian range have focused on protecting nesting trees and engaging local communities to reverse historical declines. Like other adjutant storks, it lacks a strong voice and instead communicates through bill-clattering. Its bald head, heavy bill, and vulture-like scavenging habits, combined with its very restricted modern range, make it a notable identification given its rarity.