Well, i couldn't resist a discussion on this subject. I don't have any problem following Seeker's rationale. He is distinguishing between instinct and intelligence. A being needs a brain for both. But they are not the same.
instinct: The innate, complex, and normally adaptive aspect of animal behavior.
intelligence: The capacity to learn and to solve problems and difficulties.
It seems to me that ants, spiders, etc. show only instinct, as brilliant as it may be. Squirrels kept in captivity store nuts for the winter, tho they're never exposed to cold winters. This is instinct and instinct only.
Some larger animals and more closely related to humans such as chimps do show problem-solving abilities to a lesser degree than humans.
When referring to outside intelligence being needed for something to have a purpose, this--imho--is specious reasoning. Natural selection, as Seeker clearly explained, is the force that is responsible.
I didn't understand any of the specific terms such as 'natural selection,' 'non-random mutations,' etc. until i did some reading by the scientists themselves. Until then, i was familiar only with the incorrect term fundamentalists use "blind chance.'
Cheers!
Pat
"It's easier to put on slippers than to carpet the world." (from "Stuart Saves His Family")