Excellent collection, gxseries!
I recently picked up and then quickly sold these non-circulating coins from the USSR (1991) and Russia. The 1991 ones had a mintage of 500K, while the others were 300K.
USSR 5 Roubles 1991 - Markhor or screw-horned goat (
Capra falconeri)

USSR 5 Roubles 1991 - Blakiston's fish owl (
Ketupa blakistoni), the largest living species of owl

Russia 50 Roubles 1993 - endangered Black Sea Aphalina (bottlenose dolphin)
Tursiops truncatus ponticus
Russia 50 Roubles 1994 - extinct Aurochs (
Bos primigenius), ancestor of modern cattle

Russia 50 Roubles 1994 - Greater flamingos (
Phoenicopterus roseus), the most widespread and largest species of the flamingo family

Russia 50 Roubles 1994 - Jeyran or Turkmen gazelle (
Gazella subgutturosa gracilicornis)

Russia 50 Roubles 1994 - endangered, probably extinct Sandy blind mole-rat (
Spalax arenarius)

Russia 50 Roubles 1993 - Far Eastern (Oriental) Stork (
Ciconia boyciana)

Inordinately fascinated by bits of metal with strange markings and figures