Twenty species of rare, endemic and migrant birds have been recorded in the Grizzled Giant Squirrel Sanctuary in Srivilliputhur during a recently concluded bird survey.

S. Chandrasekaran, Member of the Bombay Natural History Society, who was part of the survey, said the rare endemic species included Sri Lankan Frogmouth, Mountain and Rufous-bellied Hawk Eagles, Great Indian and Malabar Pied Hornbills, Mountain and green imperial pigeons. These species were found only in the high altitudes of Western Ghats.