The great eared nightjar ('Lyncornis macrotis') is a species of nightjar in the family 'Caprimulgidae'. It is the largest species in the family in terms of length, which can range from 31 to 41 cm (12 to 16 in). Males weigh an average of 131 g (4.6 oz) and females weigh an average of 151 g (5.3 oz), making it the second heaviest species in the family after the nacunda nighthawk.

Nightjars are medium-sized nocturnal or crepuscular birds characterised by long wings, short legs, and very short bills. Their primary source of food is insects. Nightjars are found all around the world, with the exception of Antarctica and certain island groups such as Madagascar and the Seychelles. They can be found in a variety of habitats, most commonly the open country with some vegetation. They usually nest on the ground, with a habit of resting and roosting on roads.

The subfamilies of nightjars have similar characteristics, including small feet, of little use for walking, and long, pointed wings. Typical nightjars, though, have rictal bristles, longer bills, and softer plumage. The colour of their plumage and their unusual perching habits help conceal them during the day. They are not known to live in extremely arid desert regions. Nightjars can occupy all elevations from sea level to 4,200 m (13,800 ft.).

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