We round out the alphabet this week with X , Y , and Z for Sunday Stamps . My alphabetical stamps have been animals, and for X I am grateful for scientific names! X iphias gladius , Swordfish Solomon Islands 1998 X ylocopa caerulea, Carpenter Bee Singapore 1985 Y is a trio of Y ellow-Bellies. Y ellow-Bellied Glider Australia 1997 Y ellow-Bellied Sunbird Australia 2003 Y ellow-Bellied Trogon Belize 1978 Last, but not least, Z . Z ebu Madagascar 1930 Z okor When Mongolia issued this stamp the official postal description used a generic fur-bearing rodent term that Western editors interpreted as "muskrat," as z okors were unknown outside the scientific community. Once one major catalog printed "muskrat" the others followed suit. Catalogs almost never revisit mid-century wildlife identification, so "muskrat" it remains. However, it isn't, it's a z okor! Mongolia, 1959 That ends this round of A to Z stamps....