So, all stamps show the same Zanzibar Bushbaby species, but the postcards show as follows
(I updated the info with Wikipedia).
Upper-left:
"The brown greater galago (Otolemur crassicaudatus) is a nocturnal primate, the largest in the family of galagos."
Upper-right:
"The Senegal bushbaby (Galago senegalensis), also known as the Senegal galago, the lesser galago or the lesser bush baby, is a small, nocturnal primate, a member of the galago family Galagidae."
Lower-left:
"The Zanzibar bushbaby (Galago zanzibaricus) is a primate of the Galagidae family. An adult typically weighs 100–300 grams and is 34–39.5 centimetres long (3.5–10.5 oz, 13.5–15.5 in). Like other species of galagos, their diet consists mainly of fruit."
Lower-right:
"The northern greater galago (Otolemur garnettii), also known as Garnett's greater galago, is a prosimian primate endemic to Africa."
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