pickupimage and pixabay.
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:
animal equestrian equine field grass herd horse mare meadow nature outside pasture stallion steppe summer horse horses herd animals rural village field sunset evening
Page 2017 Free-images.com. All images are Public Domain