Bushalo

The Bushalo of Mars can't be really described in words (the picture is far better suited for that).

Description
This plantimal wanders over the surface of the planet in big herds and normally is a peaceful plant-eater (although this has a totally different meaning on Mars!). However, once being provoked, the Bushalo will turn into a living battering ram, waltzing through everything in its way in order to eradicate the annoyance.

So provoking it is not recommended.