More Undead Manatees

I was taking to my sister today, the one who's fault it is that all the manatee (Also known as sea cows) searches bring up this blog. (Why are you people looking up manatee mating rituals any way?) Any way, a few of her friends are working on making a screenplay/movie which will include zombie i.e. undeadish manatees. Which leads to the question, what would a zombie manatee want? Human ones always want brains, but as herbivores would a manatee also want that? Would they want seaweeds? As zombies are slower then normal people would a zombie manatee even move?