Stuck on level 31

[vccpres]

I have replayed it multiple times and for the life of me I can't see how to get past the first few moves, which seem obvious. The pink birds, the key to the cage on the left, the purple bird over to the cat (which doesn't take it away)...the green birds...and then that's it. There seems to be nowhere free to move to! Please, any tips appreciated!

[vccpres]

Well, I persevered and conquered the level. Now I'm stuck again on a different level but I guess (hope) I'll figure it out...lol.