This trainer has been made for Bird's Town.
It has been tested with v1.0.0.1 but it may work with other versions too.

Trainer download link:
Bird's Town +1 trainer

First run the trainer.
Then run the game. (You can start the game with it's own icon or You can use the Start game button in the trainer.)
Hit the hotkey on the keyboard to turn option on/off.
You can also use the checkbox to enable/disable the options.

There is 1 option in this trainer:

1. Switch bird color

NOTES:

Switch bird color:
1. First You need to activate the cheat.
2. Hold down any keys from 1-8.
3. The next bird will have the choosen color. It is also working when You simply swap birds with the right-mouse button.

Color 1: Yellow
Color 2: Red
Color 3: Green
Color 4: Light-Blue
Color 5: Brown
Color 6: Dark-blue
Color 7: White
Color 8: Black

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Some information about virus reports for trainers generally. Read it before You post something about some virus.
http://szemelyesintegracio.hu/cheats/41-game-hacking-articles/212-trainers-and-anti-vir-softwares