Dwarf swordtail (Xiphophorus pygmaeus).
Despite of the fact that this species is called dwarf swordtail, it's not the only dwarf swordtail species around...
The thing about this species is that males hardly develop a sword. It's more common to find males without a sword. Which brings me also to the name "swordtail". The name "swordtail fish" doesn't refer to the sword but to the gonopodium of a male.
Despite of the fact that this species is called dwarf swordtail, it's not the only dwarf swordtail species around...
The thing about this species is that males hardly develop a sword. It's more common to find males without a sword. Which brings me also to the name "swordtail". The name "swordtail fish" doesn't refer to the sword but to the gonopodium of a male.
