[cobirds] Dunlin - Interspecies friendship?

The Dunlin at  McLellen continues to hangout with the Killdeer. This is my third trip and each time they have been together. Is their a mutual benefit to this relationship? I would think they could both easily find food without the other. There are coyotes at the lake. See photo in checklist. Maybe 2 pair of eyes are better that one to help alert to danger.

Then there is the Brandt and the Greater White-fronted Goose that seem to always be together at the Lone Tree golf club. Certainly there are plenty of other geese to sound an alarm.

Maybe it is just a need for companionship. And since their same species is not around, they have found another species. Other examples of interspecies friendships? 

Gregg Goodrich 

Highlands Ranch 

eBird Checklist – High Line Canal Trail--McLellen Reservoir periphery, Colorado – Thu Feb 09, 2017 – 11 species http://ebird.org/ebird/view/checklist/S34260006

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