[cobirds] Avocet hybrid - what's the mix? Broomfield & Boulder Counties

I was out at Stearns Lake this afternoon and saw a very dark Avocet-looking bird in the pond on the west side, which is Broomfield County. Below are a couple of photos. I then birded Stearns Lake in Boulder County and saw it fly over along with the 7 Avocets it was with at the pond.

The other Avocets would at times chase this bird, and it would at times chase the others. They didn't seem to be comfortable being very close to each other.

It appears to be a hybrid since none of the field guides show Avocets of any age or gender with this coloring. I'm hoping for ideas on what it is mixed with, and/or a recommendation for a website to help me figure that out. 

Thanks,

Donna Stumpp

Jefferson County

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