I tried to catch the chicken by placing the cursor right on them when they stopped, and couldn't catch any because they would always fly away. It took a while to figure out that you actually have to click in front of them so they fly into your hands.
That's right. To be honest, I'm not sure if it's a bug or a feature. Chickens should be hard to catch! I'll probably tweaks some constants so the player doesn't have to anticipate the chicken's path that much. Thanks for the feedback :)