Mimicry benefits insects as well as some species of birds. A group of slow-flying moths, sphinx moths, look superficially like hummingibirds in flight and their long proboscis is inserted into flowers in a manner similar to the way in which hummingbird tongues are inserted into flowers. This widespread species, White-lined Sphinx moth, was flying around at North Twin Pond.
Fall migration is still slow. However, shorebird flocks were seen heading south yesterday. Because there isn't much mud this year, the birds flew low looking for foraging habitat and then kept going. Lark Buntings, the Colorado State Bird, were moving around in small flocks as well, with mostly young and female plumaged birds being seen.
I don't think Mountain Plovers bred on the Chico this year. Although there were two birds around in early spring and early summer they apparently did not breed.