- In early May Ruby-throated Hummingbirds and Baltimore Orioles return
- Flycatchers such as Eastern Phoebe Great Crested Flycatcher and Eastern Wood-Pewees return early thru early to mid May
- Sedge and Marsh Wrens, Rose-breasted Grosbeaks, Thrush (Hermit, Swainson's, Wood and Veery's) and Chimney Swifts return return from winter their habitats.
- In early to mid-May, vireos and cuckoos return from their winter habitats.
- Nighthawks return. They are not hawks, but members of the nightjar family. They are common in cities and around streetlights 'hawking' for insects.
- Lilacs reach full bloom.
- Peak of warbler migration varies between May 6 to 18.
- Adult Purple Martins return to establish colonies early in month.
- Peak of bird courtship. Listen for the morning chorus..
- The year's first fireflies can be seen.
- Chickadees and titmice become scarce at feeders as they nest and raise their young.
- Eta Aquarids meteor shower is early-May. The peak viewing in Toronto is May 5-6
- International Migratory Bird Day is May 9
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