Because they're made of wood.

I think Ents should be able to recline on a watery surface and paddle along
oceans/rivers.

Maybe some of batmud's ent are made of Ebony or some such woods that their
density is higher than water's
ÄÄ

Good point. Maybe it's time to have ents choose their type of tree on reinc
ala giant. Different bonuses and penalties. Inherent WW isnt bad, but could be
off set by burning easier -fire ress. pine tree doesnt get as serious -meta in
winter, but not as big of a bonus in the spring either etc.

Does that mean everyone will pick the same type? maybe, but at least the race
might become usable again...