#pantzerleben

As you can see in the graph above, The O subfamily is divided into the Oius and the Onus genus. Let’s talk about Oius genus first:

I marked the O-I Type (O. experimentus) in pink, since we are only talking about a type here. The image of the tank that comes to mind when talking informally about the O-I species is the subspecies known as O-I Experimental (O. experimentus experimentus). Fossil records indicate that the O-I Experimental as a species is much older than the O-I, which suggests that the O-I is actually a descendant of the O-I Experimental, which seems likely given the very similar appearance and behaviour of the two species. 

Both share the same docile temperament, however they are known for displaying seemingly random bouts of aggression. Their powerful cannons can lead to serious injuries or even death with a single shot, so it is advised to always keep a safe distance to these tanks when observing them in the wild.

The Onus genus on the other hand is a much more aggressive type. While the Oius genus typically lives in small family groups, the Onus tanks only join up to hunt together and otherwise prefer a solitary lifestyle. It is not recommended to try to tame them. Observation of specimens living in captivity concluded that they do not fully shed their feral behaviours.