This is a question about education. I am trying to come up with a very visual and clear example, to explain a particular concept in evolution.
The concept I am trying to explain is,
the fact that an animal does not need to understand why it's doing something in order for that behaviour to be selected
(by "why" I mean, the evolutionary/functional role of that behaviour, the reason why it increases the animal's fitness).
Students who don't yet intuitively understand evolution, sometimes mistakenly think that in the theory of evolution, animals need to understand why their behaviour is leading to offspring in order to do that behaviour. (they might say: "the bee looks for flowers because it wants to feed his children", although bees (probably) don't actually make this computation, but simply act on stimuli).
(Note by the way that this is not simply about anthropomorphization: e.g. humans also don't need to understand what sex is for, in order to produce offspring).
What I'm looking for is an example of an animal, and a behaviour that is characteristic for that animal, that very clearly shows this principle:
It should be clear and intuitive, that the animal doesn't understand "why" it's doing what it's doing, because to reason about this would clearly be too complicated for the animal (I don't think the bee example really satisfies this).
It should be visual, and memorable.