Hi Spittle, If you noticed every sprite has a system condition called "on collision with another object" now if you add that condition and select your object that your player will collide with, for the bird animation to start.
Next to it add action from Bird sprite, and set animation to "fly" if you have it like that if not default or what is it, but usually when you type the double brackets opened ( --> "myanimation ) the animation fills in, and you can select from the list your sprite has.