A dozen Greater Prairie-Chickens sitting in a tree
Grouse and prairie-chickens often roost in trees like this group of twelve I saw in central South Dakota a while back. I suppose there are a few reasons for this. One reason would be for protection from ground predators such as coyotes. Another reason is that the winter diet of these birds consists in part of tree buds. If you are going to eat tree buds you need to get up into trees. I found this group just at dawn one morning, so I suspect they had spent the night there and were just about to have breakfast.
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