[cobirds] Possible Slaty-backed Gull, Larimer

A first cycle large white-headed Gull at Horseshoe Reservoir in Loveland (Larimer) seems to check most boxes for Slaty-backed Gull. See photos below. Warning: this age/species combo is very difficult to confirm so may not get confirmed in eBird or accepted by a records committee. But wanted to share to give folks an opportunity to look for it.

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