I believe this Whitetail Deer drinking from the river is a young Buck that has shed his antlers. This Deer was drinking from Reeves Slough which is at the Sequoyah National Wildlife Refuge in Oklahoma.

I was standing near the Phillip Parks Memorial Fishing Pier at the Sequoyah National Wildlife Refuge. I was hand-holding my camera.
Gear Used:
- Camera: Fujifilm X-T3
- Lens: Canon EF 100-400 mm f/4.5-5.6 L IS II (attached with a Fringer EF-FX Pro)
Technical:
- Location: Sequoyah National Wildlife Refuge (Oklahoma)
- Date and Time Taken: January 29, 2021 (08:55 A. M.)
- Aperture Priority
- Aperture: f5.6
- Shutter speed: 1/480 (as determined by the camera)
- ISO: 1000
- White Balance: Auto
- Metering Mode: Multi
- Back-button Focus
- Single Point Continuous Auto Focus
- Exposure Compensation: -0.33
- Focal Length: 400 mm
- Processed With Luminar 4