There are concerns about hummingbirds and orioles having different sized beaks, and asking if they will share feeders.

Source: https://www.sandiegouniontribune.com/columnists/story/2023-05-13/column-many-asking-where-have-all-the-orioles-and-hummingbirds-gone

They do that to clean their beaks by rubbing them on a branch or any other surface from side to tip of the beak.

Source: https://indianexpress.com/article/cities/ahmedabad/birds-without-borders-asian-koel-8883399/

While their prey hangs in their beaks, they shake them to break their spines before gulping them down.

Source: https://www.columbiavalleypioneer.com/blue-herons-masters-at-catching-fish/