Aerial view of tundra swans in flight

An aerial view looks down over an expanse of water, with marsh and forest visible in the distance. The water is speckled with patches of green vegetation. Above the water, dozens of white, long-necked swans are flying in loose flocks. Part of an airplane wing is visible in the corner.
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.
Facility
Mattamuskeet National Wildlife Refuge
Ecosystem
Lake
Wetland
Species
Cygnus columbianus
Subject tags
Birds
Surveying
Waterfowl
Wildlife refuges