Happy Friday.
These 1970s stamps arrived as part of a complimentary packet of world stamps from my supplier of stamp albums and pages.
I might still start a thematic collection and animals. It would have to be a specific animal— or kind of animal— to narrow it down to a few thousand stamps!

Issued Sept 5, 1973
Perf. 12×11¼ |Photogravure |No Wmk
802 20₮ Multi-colored | European badger (Meles meles)
[Sources: Stampworld.com, Google Search Labs| AI Overview]

Issued Mar. 10, 1972
Perf. 13½ |Design: Design: Nicolae Săftoiu |Engraving: Fabrica de Timbre, Bucharest |No Wmk
2995 35b Multi-colored | Red fox cubs (Vulpes vulpes)
The red fox (Vulpes vulpes) is the largest of the true foxes and one of the most widely distributed members of the order Carnivora, being present across the entire Northern Hemisphere including most of North America, Europe and Asia, plus parts of North Africa.
[Sources: Stampworld.com, Wikipedia]

Issued Mar. 20, 1978
Perf. 13½x13 |Design: Severin |No Wmk
921 20c Multi-colored | Chimpanzees (Pan troglodytes)
The genus Pan consists of two extant species: the chimpanzee and the bonobo. Taxonomically, these two ape species are collectively termed panins.
[Sources: Stampworld.com, Wikipedia]

Issued Oct. 9, 1973
Perf. 13 |Design: Jumelet |Engraved |No Wmk
747 5Fr Multi-colored | Greater dwarf lemur (Cheirogaleus major)
The greater dwarf lemur, or the Geoffroy’s dwarf lemur, is a lemur that is widely distributed over the primary and secondary forests near the eastern coast of Madagascar.
[Sources: Stampworld.com, Wikipedia]

Issued Jul. 10, 1974
Perf. 11 |No Wmk
1320 5ch Multi-colored | Oriental fire-bellied toad (Bombina orientalis)
The Oriental fire-bellied toad is a small semiaquatic frog species found in northeastern Asia, where they primarily dwell in slow-moving bodies of water and temperate forests.
[Sources: Stampworld.com, Wikipedia]

Issued Mar. 20, 1976
Perf. 12 |Photogravure |No Wmk
808-815 A278 12xu Multi-colored | Masked palm civet (Paguma larvata)
The masked palm civet, also called the gem-faced civet or Himalayan palm civet, is a viverrid species native to the Indian subcontinent and Southeast Asia.
[Sources: Scott 2009 Standard Postage Stamp Catalogue, Wikipedia]

Issued Aug. 25, 1975
Perf. 12 x12 |Lithography |No Wmk
4363 A2068 6k Multi-colored | Siberian marten (Martes zibellina)
The Siberian marten or sable (Martes zibellina) is a species of marten, a small omnivorous mammal primarily inhabiting the forest environments of Russia, from the Ural Mountains throughout Siberia, and northern Mongolia.
[Sources: Scott 2009 Standard Postage Stamp Catalogue, Wikipedia]

Issued Nov 3, 1976
Perf. 11¾ x 11¼ |Design: J. Baláž |Engraved and Photogravure |No Wmk
2343 20h Multi-colored | African elephant (Loxodonta africana)
[Sources: Stampworld.com, Google Search Labs| AI Overview]

Issued Oct. 12, 1972
Perf. 12 |Photogravure |No Wmk
701 12xu Multi-colored | Red-wattled lapwing (Lobivanellus indicus)
The red-wattled lapwing (Vanellus indicus) is an Asian lapwing or large plover, a wader in the family Charadriidae.
[Sources: Stampworld.com, Wikipedia]

Issued May 6, 1972
Perf. 13 |Design: P. Lambert |Photogravure |No Wmk
526 4Fr Multi-colored | Spider: Argiope sector
Argiope sector is a species of orb weaver spider that is found in North Africa, the Middle East, Senegal, and Cape Verde.
[Sources: Stampworld.com, Google Search Labs| AI Overview]

Issued Nov. 11, 1974
Perf. 12½ |Designer: Eva Zombory |Photogravure |No Wmk
3019 80f Multi-colored | Butterfly: Parnassius apollo
[Sources: Stampworld.com, 2018 Scott Standard Postage Stamp Catalogue, Google Search Labs| AI Overview]