Swooped (closely) three times. Stealthy Magpie - no squawking. Note also that about a week before a large black snake was on the bike path, luckily parallel and not across the path. Was just on north side of swampy area where you go under roads above. Came as quite a surprise as was just around corner. Had no time to change my mind! The snake was not aggressive - I think it hardly moved. Suspect it was appreciating the heat from the asphalt.