Jim and I lead a birdwalk to Cromwell Valley Park on Sat, March 28th, and there is not much that morning, except had a Killdeer flyby, a pair of Tree Swallow checked out the Bluebird's nestbox, many dozens Eastern Bluebird upstream and a nice count of 21 Black Vulture. Late afternoon at the same park, a Yellow-throated Warbler show up at a Willow Tree downstream, finally the warbler are back!! Later, saw two Great Horned Owl seen flyby (we seen the pair of owl every night). Kevin Graff Baltimore, MD ggraff@erols.com