The Koonthankulam Bird Sanctuary is located in the small village of Koonthankulam in the Nanguneri Taluk. This village has become the new habitat for various migratory birds, which fly back to their native place after laying eggs in the village. The sanctuary occupies around 1.29 sq km of the total forest area of Koonthankulam.
Migratory birds flock the region from the end of December till June. It is believed that this village is visited by around 35 species of birds during the breeding season.
Painted stork, the major attraction of this village, flies here from north India and east European countries. Another prominent species of migratory birds is the flamingo that visits this village from the Rann of Kutch.