Zambia contributed to the WWF 25th anniversary a coins celebrating the White-Winged Flufftail ( Sarothrura ayesi ).
The bird is a kind of rail, the family of Rallidae, birds which generally are either flightless or weak flyers. Interestingly enough, the weakness of flight means that when they migrated they often get blown off course and as a result have come to inhabit many isolated islands. The family is considered somewhat primitive and generally live in marsh lands.
A very rare species of Africa, they come in chestnut color with a whitish chin. I can't find much more information than on the flufftail, and avian classifications and families, although a lot of exciting work has been done in the field in the last 20 years.
The coin is a 10 Kwacha 0.925 Silver fineness, with a weight of 27.22 grms. and a diameter of 40mm, one of the largest coins in the collection.
It was minted in the British royal mint in proof grade, 25,000 specimens.