Farm Heroes Saga Collect Chickens.

On some levels you will need to collect chickens.  
See image.

To collect chickens you have to first match up 3 eggs, which make a cracked egg.
The cracked egg will be in the place that you moved the third egg TO...See below.

Then you need to match up 3 cracked eggs to make a chicken..

 The chicken will then fly across and be added to your score...

Here is a video showing how it all works.
This is level 38..