| Nyctibatrachus major | |
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Amphibia |
| Order: | Anura |
| Family: | Nyctibatrachidae |
| Genus: | Nyctibatrachus |
| Species: | N. major
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| Binomial name | |
| Nyctibatrachus major Boulenger, 1882
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| Range of N. major; reports of the species from Maharashtra are probably erroneous[2] | |
| Synonyms[3] | |
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Nyctibatrachus major, the Malabar night frog, large wrinkled frog, or Boulenger's narrow-eyed frog[3] is a species of frog in the family Nyctibatrachidae, commonly known as the robust frogs. It was described in 1882 by the zoologist George Albert Boulenger, and is the type species of the genus Nyctibatrachus. It is a large frog for its genus, with an adult snout–vent length of 31.5–52.0 mm (1.24–2.05 in) for males and 43.7–54.2 mm (1.72–2.13 in) for females. It is mainly brownish to greyish in colour, with a dark greyish-brown upperside, a greyish-white underside, and light grey sides. It also has a variety of grey or brown markings. When preserved in ethanol, it is mostly greyish-brown to grey, with whitish sides. Sexes can be told apart by the presence of the femoral glands (bulbous glands near the inner thigh) in males.
The species is endemic to the Western Ghats mountain range of India, where it is found in Kerala, Tamil Nadu, and Karnataka. Adults inhabit fast-moving forest streams at elevations of up to 900 m (3,000 ft) and have highly specific habitat requirements. Adults are mostly found in or near water and are nocturnal; subadults can be found during both the night and day. Its diet mainly consists of other frogs and insect larvae. Over a period of several days or weeks, females lay multiple small clutches of eggs on leaves and rocks overhanging water; tadpoles drop into the water below on hatching. The species is currently classified as being vulnerable on the IUCN Red List owing to its small and fragmented range and ongoing habitat degradation. Threats to the species include habitat loss, increased human presence near the streams it inhabits, and possibly nitrate pollution caused by fertiliser overuse.