All hatch colors have a percentage.
Natural is the most common hatch color.
You can view the percentages of each hatch color by clicking on, "View Hatch Color Chances" in the Hatchery
Otherwise they are:
Sepia Cream Black Ginger Silver Blonde Calico Achro Albino
20% 15% 10% 5% 3% 2% 2% 2% 1%
*The chance to hatch Achromatic only applies to a few select creatu each month.