octoboy
I Crush Everything
Zangoose and Seviper just fight due to their DNA.
I imagine it all started when one of them stole food from another, and a huge species fight quickly escalated.
If it was genetic, that means it wouldn't be from an escalating fight of stealing food. A grudge is no more genetically passable than a cut off tail.
...Not that that's either here nor there, but just pointing out.