Although their migrations have similarities, they also have differences. Birds and butterflies face unique challenges. The species have different flight speeds and lifespans. Spring temperatures also affect the migrations differently.
![Animated hummingbird in flight.](https://s3.us-east-2.amazonaws.com/journeynorth.org/images/graphics/humm/RubySalvia_Anim_RussThompson.gif)
Image: Russ Thompson |