my bad animal couplets

by the way, here's a tree-death (printable) version

1. The Dolphin
Man's benign aquatic friend the dolphin
Almost equals Man in problem-solphin'.

2. The Hippo
Underneath a stack of things topped with a hippopotamus,
I would be upset to find, at the very bottom, us.

3. The Katydid
In a choral group of insects lined up nine by nine, the katydid
Had a louder, more melodious voice than the other eighty did.

4. The Newt
You'll seldom see a newt
Dressed in a three-piece suit.

5. The Yorkshire Pig
The Yorkshire
Is pork-sure.