Kiwi

Kiwi! is an animated short made for creator Dony Permedi's master's thesis in animation. It tells the story of a very determined kiwi bird who works to accomplish his dream. At only two minutes and thirty seconds long, it might have the shortest "start-to-Tearjerk" ratio of any cartoon around.

Watch it on Youtube here. Bring tissues.

Tropes used in Kiwi include:

Armless Biped: Well, it is about a Kiwi. He seems to be able to do most things he wants, but obviously not everything...
Bittersweet Ending: He gets what he wants in the end, but at a pretty steep cost.
The Determinator: The Kiwi, definitely. He will experience flight.
Downer Ending: Thud.
Disney Villain Death: Kiwi
Goggles Do Nothing: They certainly don't stop the tears...
Hammerspace: From whence he pulls an actual hammer, plus some nails.
Mood Motif: Very effective. A tuba plays for the kiwi's first appearance. A xylophone plays during his flight. Cue the tears.
Single Tear
Sound-Only Death: Thunk
Tear Jerker: No one doesn't cry when his little wings pop out. NO ONE. Also, the very last sound may be the saddest noise from anything ever.
- Also, when he closes his eyes and a Single Tear escapes.