Mexican swordtail
Back caption: Mexican Swordtail / Xiphophorus helleri. One of the better known species of small aquarium fishes which gives birth to active young. The male is distinguished by a long sword-like process on the lower part of the tail.
ca. 1930s
Photograph
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English
Digitized by Wildlife Conservation Society Archives
1 postcard: colored photograph ; 9 x 14 cm
Wildlife Conservation Society Archives Collection 2016
2016-pc-773