apropos of
7. The male preying mantis cannot copulate while its head is attached to its body :

"The juvenile sea squirt wanders through the sea
searching for a suitable rock or hunk of coral
to cling to and make its home for life.

When it finds its spot and takes root
it doesn’t need its brain any more
so it eats it.

It’s rather like getting tenure."

-- Daniel Dennett, Consciousness