A fish is an animal therefore it can be classified as both.
why not
A red-tailed shark female and a red-tailed shark male.
No they cannot, also if you put two Betta fish together, they will fight.
No, red tailed sharks get too large to survive in a 1 gallon fish tank. Only very smally fish such as endlers or guppies, or a betta, would be ok in a 1 gallon aquarium.
I wouldn't recommend it - since the RES will view the fish as food !
Ther is no apparent sexual dimorphism in Red Tailed Black Sharks.
its a predator
Yes , they can if you have a big tank.
Yes, but make sure that you have a biggen enough aquarium. :/
How long a red tailed catfish can stay out of the water depends on the fish in question and how moist the fish's gills are.
At over 18 inches Oscars can get large enough to eat a fully grown Red Tailed Black Shark (Rainbow). I would not consider it. Ther is no such thing as an Oscar that will not eat a smaller fish when it is hungry.
They are called a Red Wagtail Sword.