Yes, It is like Kawri (Crow) to seen. But I have no idea about Papiha as well as Brain Fever Bird.
According to “ আধুনিক অসমীয়া শব্দকোষ -
কেতেকী - Indian Nightingale ; Hierococcyx varius
So scientific name of কেতেকী is Hierococcyx varius. And the scientific name of Brain fever bird (Common hawk cuckoo) is Hierococcyx varius. So কেতেকী and Brain fever bird is the same bird. The new Scientic name is Cuculus varius
Cuculus varius
SUBFAMILY
Cuculinae
TAXONOMY
Cuculus varius Vahl 1797, Tranquebar India. Two subspecies recognized.
OTHER COMMON NAMES
English: Ceylon hawk cuckoo,
brain-fever bird;
French: Coucou shikra;
German: Wechselkuckuck;
Spanish: Cuco Chikra.
Hindi: Papiha, Kapak or Upak
PHYSICAL CHARACTERISTICS
13 in (33 cm); 3.6 oz (104 g). Tails are banded, with bars on the abdomen and flanks.
DISTRIBUTION
India, Nepal, Bangladesh, Myanmar, and Sri Lanka
HABITAT
Montane forests, deciduous and evergreen wooded areas; also pine forests, gardens, groves, and bamboo thickets.
BEHAVIOR
Loud, shrieking call, often heard singing at night with a bright moon.
FEEDING ECOLOGY AND DIET
Insects, including caterpillars, termites, grasshoppers, beetles; they also eat fruits and berries. Arboreal and secretive foragers.
REPRODUCTIVE BIOLOGY
Brood parasitic; breeding March–July in India, and January–April in Sri Lanka.