Journey with artist Alan Messer to some of his favorite landscape features in Central Park's wooded Ramble, including the Gil and Tanner Spring, discovering along the way both resident and migrating birds. During Spring migration in May, delight in the colorful warblers, hummingbirds, tanagers, and thrushes. $15 (members, students, educators, seniors $12) To reserve tickets, call (212) 485-9205. Charge your order to Visa, Mastercard or American Express. Advance payment is required to guarantee a spot.