I observed a large number of these Calosoma's flying, on the ground, and climbing Sycamore and other trees during the day at a grassy soccer park in Newport Beach, CA. It was very warm (88 - 94 degrees and slightly overcast; unuusual weather for late April. I took four home and two of them ate Tussock Moth caterpillars I found in my backyard that I threw in the cage I had the beetles in. I do not know how seasonal these beetles are, but this is the first year since the late-1980's that I have seen them. Thanks to anyone who has more information on them, such as why they seem more common in disturbed coastal areas and not in the oak woodlands where I live only 10 - 15 miles from the coast and their life cycle?