A Turning Tern

Forster's Tern -- Arrowhead Marsh, Oakland, CA
Canon EOS Rebel T5i, EF-S 55-250mm f/4.0-5.6 IS II, 1/1250s, f/5.6, ISO: 100

I enjoy watching the terns fish at Arrowhead Marsh.  I see mostly Forster's terns and occasionally a Caspian's tern.  The Forster's terns hover until they spot something they like, then they do a barrel roll and dive straight down into the water.  Looks like fun.