The flamingo uses its bill when feeding to filter mud and water from the tiny plants and animals that it finds in shallow ponds.
The flamingo uses its bill is feeding to filter mud and water from the tiny plants and animals that it finds in shallow ponds.
The flamingo uses its bill that it is feeding to filter mud and water from the tiny plants and animals that it finds in shallow ponds.
The flamingo uses its bill was feeding to filter mud and water from the tiny plants and animals that it finds in shallow ponds.