Which is the smartest bird?

The answer may/ may not surprise you but get this... ravens/crows are among the smartest of all bird species in the world.

Tested and observed by scientists, ravens (see pic on the left) are the smartest birds whether in the wild or lab. E.g. of their intelligent behavior is that these birds are seen to drop hard to crack nuts into the road and waiting for incoming cars to smash them open. Other shows that the bird buried up to 30 thousands seeds to be kept for winter and able to find/ recover back up to 90% of them back. Impressive huh?

I remember as a child, I saw this educational video on the TV, it shows that a raven is trying to drink from a bottle of water, but the water resides deep inside the container. what it does was it searched for small pebbles/ rocks and threw them into the bottle, it did this until the water level was high enough for it to sink its beak into the mouth to reach the water inside. Pretty smart I guess, but I never thought that only ravens can do this. I thought they simply pick a bird. ha ha.