Mammals lay no eggs outside of their bodies because they lay them inside of their bodies.
Marsupials carry babies around in sacks like babies are groceries from the corner carry-out.
Fish passively lay eggs in giant areas so that just about anything that wants to can attempt to germinate.
Birds make nests.
Where does John fit in?
Snakes leave their skin on the ground because they are comfortable without it.
Trees leave leafs to die around them to fertilize.
Sheep need their wool to be taken from them or else they'll get too hot.
Sharks have too many teeth to keep.
What does John have to lose?
At the bottom of the ocean are giant squid like the kraken.
At the tops of Sequoia live exotic rodents.
In the middle of mountains are either precious metals or dragons.
And in outer space there could be aliens or angels.
What is habitat for John?
John W. McEwers
http://www.poemhunter.com/poem/zoology/