parakeet injury

I'm not sure when this injury occured but im guessing around 3am when he had a night fright. i didnt notice until i came back from school, and now im worried that this injry is lethal or something. the blood looks dried but still im worried

Hey folks, just wanna share something that happens this morning. A few hours ago, I took my parakeets out into a small sunroom so that they could fly around. But this particular parakeet's name is Clyde. After I got all of the parakeets out of their cage and into the sunroom, I left the room...