Buttons:

Feed - Gives the bird a piece of feed which it then eats
Hover - The bird starts to hover down towards the floor
Swoop - The bird goes into a small dive and the flys back up to the level it was at
Reset - The reset button makes the bird stop whatever it is doing and moves it to a random position

Clicking on the canvas:

Branch - Clicking on the Branch will make the bird sit on the branch
Eye - Clicking on the eye of the bird will make it change to a random colour
Anywhere else - Clicking anywhere else on the canvas will make the bird move to that position