Join us in February as we track spring's journey across the Northern Hemisphere! Spring 2002 Calendar How You Can Help Track Spring! Bald Eagle Caribou Hummingbird Manatee Monarch Robin Whooping Crane Gray Whale Mystery Class (Photoperiod) Tulips And Other Signs of Spring Earthworms Frogs Ice-out Leaf-out Loon Maple Sugar Oriole Red-winged Blackbird Barn Swallow Humpback Whale Right Whale All Other Signs of Spring Related Units Phenology Data Exchange Unpave the Way for Wildlife Weather and Migration Symbolic Migration