Short and a bit scrappy
The art itself was slightly less than decent on the whole, unfortunately. Whilst it looks okay, little things stand out as scrappy, for example the 20cm or so river, the tree with its roots put in through erasing part of it, and the uneven brush lines (in general).
This animation featured mostly motion tweening and looping symbols. Furthermore, the little bit of frame by frame was quite obviously rushed. Animation is a pain in the butt, but if you could just put in a few more frames and be more careful about how it's done, it'll make your animation look much better, like when the bird poops on his tongue, he seems to wipe it away, and it sort of disappears. Perhaps you could animate it being slowly wiped off onto the ground.
Lastly, besides the length, you need more sound. The sound the blue fuzz makes when mocking the bird would almost be more appropriate for the bird defecating on the blue fuzz. Other sounds could include frustration at the bird and something similar but not quite the sound you used for him mocking the bird.
It was alright though, keep working on it!