Aerial view of tundra swans in flight

Photo By/Credit

USFWS

Date Shot/Created
12/15/2015
Media Usage Rights/License
Public Domain
Image
Aerial surveys are used at Mattamuskeet National Wildlife Refuge and other refuges across the United States to count the numbers of wintering waterfowl using refuges.
Ecosystem
Lake
Wetland
Subject tags
Birds
Surveying
Waterfowl
Wildlife refuges