Green swordtail was created in 1848.
Swordtail is not a mammal, it's a fish although it gives birth. Another example like Swordtail is Guppy. Guppy gives birth but it's a fish.
A swordtail is a tropical fish and a goldfish is not. The swordtail would need a higher temp. than the goldfish. Depending on where you live it probably wouldn't survive the winter.
yes
It's a fish.
Tropical fish flakes
yes
Her tummy will be smaller.
Swordfish, swordtail
Yes
they proctect the body if is danger
There are guppies and mollies.