There are various mutations of the Mandarin Duck found in captivity. The most common is the white Mandarin Duck. Although the origin of this mutation is unknown, it is presumed that the constant pairing of related birds and selective breeding led to recessive gene combinations leading to genetic conditions including albinism. (Wikipedia)
Discus Fish (Symphysodon spp.) Selective breeding has resulted in diverse colour and patterning variation amongst discus species. From the original three species of wild fish, Discus have been line bred and hybridised to produce some stunning tank-bred fish with amazing all-over body colour.
Love......The Akhal-Teke horses are vigorous, excitable, and restless. Thousands of years of selective breeding have left their mark not only on their physical appearance and efficiency, but also on their behavior. These horses are not only sensible but also very sensitive; they are even able to respond to mental suggestions of humans. Their intelligence is not comparable to any other breed.