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![Bison Males Head Butting in Yellowstone National Park](http://d38zjy0x98992m.cloudfront.net/95998580-e892-4a6f-af40-ba49531f9c5e/Yellowstone_NP_May-505_xgaplus.jpg)
Bison Males Head Butting in Yellowstone National Park
Buffalo, Bison bison, aggressively head-butting in a strength contest along the Madison River in May in Yellowstone National Park, Wyoming, USA
Author: Lee H. Rentz
© Lee H. Rentz: All Rights Reserved
Photo size: 1.5 Mpixels (4.29 MB uncompressed) - 1500x1000 pixels (5x3.3 in / 12.7x8.5 cm at 300 ppi)
Published in: YELLOWSTONE NATIONAL PARK
![Bison Males Head Butting in Yellowstone National Park](http://d38zjy0x98992m.cloudfront.net/7f884818-6202-43dc-84ef-4ddb1d40eda3/Yellowstone_NP_May-494_xgaplus.jpg)