Question

who think the lion is the smartest​

Answer 1

Answer:

Lions

Lions are the Smartest of the Big Cats! The social nature of the lion may be more beneficial than just having someone around to groom the tough spots. The "social intelligence hypothesis" proposes that social complexity results in cognitive complexity.

Answer 2

Me , because:
Using tools doesn't make humans, dolphins, and crows smart. Rather, it's the stress and challenge of living with others—recognizing friend from foe, calculating who to deceive and who to befriend—that led these and other social creatures to evolve their cognitive skills