A few years back S.U brought out a set of stamps called "Hey Chick", if I remember rightly it was a Sale a bration set. (
which means it was a free set when you spent £45 ) It was a popular set at the time so S.U have brought it back along with a second chicken set called "Hey Birthday chick".
The art work on both sets is the same style so there are no issues when mixing and matching the stamps. They have even brought out some dies to go with these sets.
This image is from the Hey Chick set and the sentiment is from the Hey Birthday Chick set.