I don't know where else to put suggestions so sorry if you don't want this here but I was thinking of what you could do with a woodpecker.

Woodpeckers would spawn in dark oak, oak, or taiga biomes. When a woodpecker spawns it will randomly latch onto a tree and begin to peck over time, creating a sound, the woodpecker has a chance to grab a item or make a nest, when grabbing a item they can get a maggot, sticks, and other items. If an item is not edible it would drop it. If a woodpecker makes a nest it would behave like a bee however only one woodpecker could access it. With it's nest it would fly around it until it again pecks a tree. Once it pecks a tree and grabs a item it will return it to it's nest which you can access by right clicking. You will see the item it put in it's nest then it would leave it's nest to fly around again. items would not be stackable in the nest.

Woodpeckers would be aggressive to flies.

A woodpecker can only have one nest at a time and if it gets full it will continue to peck trees randomly and eat maggots that it collects. The woodpecker is diurnal and will go into it's nest at night. (like how a bee does) If a nest is destroyed by a player the woodpecker would attack the player until it's low health, then it would fly away. Sometimes, if a woodpecker nest is not full, a woodpecker will lay it's egg in it's nest which can be hatched like a chicken egg.

Woodpeckers would be hunted by cats and foxes.

Woodpeckers can be bred with maggots and they can be tamed with seeds. Once tamed, they don't follow the player around but instead wont attack you when breaking their nests.

Items that can be retrieved from pecking into wood can be: Maggots, Sticks, Stone buttons, honey (more rarely), bison fur (also more rarely) and diamond (extremely rare)

Extra note: Woodpecker nests would replace the normal woodblock with a hole texture in the woodblock and woodpeckers would behave like how a bee would behave to it's nest

Thanks for reading! If you want this deleted or moved somewhere else just tell me in the comment section