ফেঁচুৰ দেহৰ বৰণ জিলিকা ক'লা আৰু নেজডাল দকৈ দুভাগ কৈ কটা৷ পূৰ্ণবয়স্ক মতা ফেঁচু চৰাইৰ 'গেপ'(gape)ৰগুৰিত বগা দাগ থকা দেখা যায়৷ The iris is dark brown (not crimson as in the similar Ashy Drongo). The sexes cannot be told apart in the field. Juveniles are brownish and may have some white barring or speckling towards the belly and vent, and can be mistaken for the White-bellied Drongo. First-year birds have white tips to the feathers of the belly, while second-years have these white-tipped feathers restricted to the vent.

They are aggressive and fearless birds, and although only 28–cm (11–in) in length, they will attack much larger species that enter their nesting territory, including crows and birds of prey. This behaviour led to their former name of King Crow. They fly with strong flaps of the wing and are capable of fast manoeuvres that enable them to capture flying insects. With short legs, they sit upright on thorny bushes, bare perches or electricity wires. They may also perch on grazing animals.

They are capable of producing a wide range of calls but a common call is a two note "tee-hee" call resembling that of the Shikra ("Accipiter badius").

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