The Compendium of Caraka 1.27.43

1.27.43

utkrośaḥ puṇḍarīkākṣo megharāvo 'ambukukkuṭī/
ārā nandīmukhī vāṭī sumukhāḥ sahacāriṇaḥ//

The eagle, lotus-eyed goose, thunder-calling duck, water hen, / spoonbill, openbill stork, and sandpiper—these move in flocks;