Date: 7/3/19 10:07 am From: Priscilla Sokolowski <priscillanhk...> Subject: [obol] Green Heron eating 5" Lampreys - Delta Ponds
After photographing the Red-shouldered Hawk Tuesday morning, and while standing in the same place. I noticed a Turkey Vulture and three Green Herons all within 20 feet of each other, perched on fallen logs. Two fledged Green Herons on logs and one adult feeding along the silty shoreline of a narrow channel with no current (at this time). The adult Green Heron caught what I thought was a small snake, then another the same size, then yet another and finally a fourth one - all within 6 minutes and all the same size. By the time he caught the second one I saw in my photos that these were not snakes at all. They had flattened ("keeled") tails - although the body and tail were not distinct from one another but one continuously evolving shape from cylindrical to keeled. There do not seem to be many species to pick from, so unless someone introduced some exotic species these must be some kind of Lamprey. Since there were four of them in a six-foot stetch of silty shoreline, there must be "something going on" with them - ie arriving, spawning, emerging / metamorphosing ...? Do any of you know about these interesting critters?