Yeah theyr hard bastards ! my snakehead has tried too eat my walking cat 3 times , and hes still alive he just recently healed from last attack where the SH had the half walking cat in hes mouth... i didnt feed the SH for a day and now hes been Chewed on again huge marks all over the poor guy. he seems to be doing pretty ok tho even tho hes been attacked , they heal quiet good!