Teeter-totter

When Fern and I were at Cattle point last week we noticed this crow. Fern said, "Look, he's got a teeter-totter" and as we watched he walked from the low side of that board to the center and then when it began to dip he continued down until it rested in the puddle and then he took a drink. I don't know what kind of advantage he gained by this but for whatever reason it seemed like he knew perfectly well what he was doing.