Tallbirds are very territorial and will attack the Player if they get too near their nests or if they try to steal their eggs. A tallbird can outrun a player (But if the player never stops running, a tallbird cannot hit the player), and usually do not stop chasing until several days later. At night, a tallbird will curl up in a ball around its nest. A player can then steal its egg without aggro'ing the tallbird at all. A tallbird's eyes will turn red right before it attacks, then sending its beak down to the ground.
The Tallbird resides in rocky biomes only.