There was a time when scientists believed the best measure of intelligence was using tools to solve a problem. Humans and apes used tools, therefore, we must be intelligent! However, as more animals are being filmed fashioning tools and using devices to get what they want, the hypothesis is shifting.

PHOTOS: Animals and Their Tools

Here, a green heron uses a simple piece of bread to lure a fish near enough to catch. The bird seems to be carefully positioning and removing the bait with the goal of drawing the fish into its reach. Just before the bread runs out, the heron strikes and gets itself a nice meal. Tool use achieved! via YouTube

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