On ants

Article: http://news.bbc.co.uk/2/hi/science/nature/4319739.stm

Excerpt:

It seems that ants are not just dumb miracles of evolution - they can learn from experience.

When you destroy their nest and make them migrate to a new one, they manage it very efficiently, as you would expect.

If you repeat the exercise next day, they achieve the same thing - but this time they do it even faster. Now that's scary.