How can you get Mighty Eagle in the Angry Birds Rio without buying it?

To unlock Mighty Eagle in Angry Birds Rio without making a purchase, you can use the free trial version available within the game. This trial allows you to use Mighty Eagle for a limited time on specific levels. Additionally, you can look for promotional events or updates from the developers that might offer the character for free temporarily. Always check the game’s official social media channels for any announcements that could provide free access.