It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
This image was acquired from
Keywords from Image Description:
Hundreds of walruses gathered together on beach. Check categories October en br Image title Hundreds of walruses gathered together on beach Image from Public domain images website publicdomainimage html publicdomainimage Fish and Wildlife Service Not given Transferred by on This file is in public domain not copyrighted no
Page 2017 Free-images.com. All images are Public Domain