The mouth of a tree leader is all about trying to preserve the trees. In fact, he guarantees that he will preserve the trees if it's the last thing he does.
He chains himself to a tree to preserve them. But, unfortunately, the lumberjacks just take a giant back hoe (ほ) and tear this tree leader and the tree he's attached to in half.
Currently there are no similar looking kanji which exist in the WaniKani learning system