Cockroaches in Africa that are as big as a dollar bill (if you don't count the antennae, which are again as long as they are) and transparent, so you can see not only thier insides, but the floor through them as they scuttle around.

Also in Africa, Tunisia I think (it has a 4th grade flavor), there were caterpillars also the length of a dollar bill, but only about an inch in diameter, that were BRIGHT BRIGHT KELLY GREEN and had big triceratops horns.

Preemies! Timothy, especially, at 2lbs11, was not even in the human larval stage...

And I saw something once, not sure where, that looked a lot like the little aliens the cat/woman and bald man turned into at the end of Catspaw, I think, but I might not have the right Trek episode...