These Birds are 100% Flash Vector Animation. It can be resize and it is only 7kb each.You can also embed it to your html page.

The best part about Cute Twitter Birds Button is that you don’t have to open the FLA to specify your “Twitter Link”. You can do this through the embedding code. This is explained in the documentation file. You just need to open the FLA if you want to change the color of the bird.

Each birds have been separated to individual FLA so that you can work on them easily.