Plural, Singular?

Should Uroborus be considered as 4 heads/bodies making up a single monster, called Uroboros, or each independent head/body called Uroboros? Something like: When an Uroboros is killed it will turn black, however it can still attack. or something like that. The section on it uses Uroborus in both ways.

would make more sense to say "when a head of the uroborus is killed it will turn black, but still be able to attack" since just saying uroborus would be confusing

^ Agreed.

And the plural form should be something like Uroborii ~小太郎 ^TALK_CONTRIBS 2011:05:10:20:56 (Tuesday)