- Project FeederWatch ends this month, www.birds.cornell.edu/pfw
- Early April migrants include the American Woodcock, Eastern Phoebe, Eastern Towhee, Fox Sparrow, Snipe and Tree Swallow.
- Research stations affiliated to the Canadian Migration Monitoring Network open on April 1 to start spring passerine research
- Late April migrants include the Brown Thrasher, Pine Warbler, Palm Warbler, American Bittern, Chimney Swift, Chipping Sparrow, Barn Swallow and Caspian Tern.
- Great Horned Owls have their young.
- Hummingbirds and orioles arrive late April/early May. Be sure to have their feeders ready.
- The Common Loon finishes its northward migration by the end of April. Some late migrants arrive in May.
- Purple Martins (scouts) begin to arrive in mid April
- Cardinals begin nesting.
- White-throated Sparrows begin calling.
- Woodcocks continue their "sky dance" courtship flights.
- Bluebirds are nesting by end of the month. Be sure to have their houses ready.
- Lyrids meteor shower - peak April 21 - 22
- Earth Day, April 22.
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