piranha
Surely someone is going to second the Portugese Man o' War?
The Fish/Sea Mammals category is small.
Blue ringed ocotopus?
you'll have to convince me on this
what is hard about it?
Snake Head fish...
It can kill entire Ponds and survive on land.
The snakehead fish has hit the United States.
* Survives icy winters and oxygen-deprived waters
* Grows to three feet
* Can crawl out of water, wiggle across land for four days
* Capable of clearing out a pond of all living creatures and then wriggling on to new hunting grounds on its belly and fins.
"If you catch it, kill it," said Bob Lunsford, biologist. "It's not a dead or alive thing, we want it dead."
we could do with FOUR MORE sea beasts and SEVEN more lizards/amphibians as that'd make it even across the board
there must be some hard SNAKES or something?