their uppertail coverts and tail base have more rufous (adult female rufous can be all-green); and their chip calls are slightly lower pitched. Also see female and immature calliope hummingbird ...

The hummingbird migration maps for 2025 show the birds have come back to Iowa for the season. Here's how to track sightings ...

Spring migration path of hummingbirds According to Pennsylvania Game Commission's fact sheet on the ruby-throated ...

Temperatures are on the rise, green is showing up and hummingbirds are on the move. All signs that spring is officially here. Over the next couple of months, colorful Ruby-Throated Hummingbirds ...

Hummingbird Central uses citizen science to track the annual migration of hummingbirds, using user-reported sightings to map ...