There are different ways of measuring intellect. But, in terms of survival, it looks like any of the animals that have survived in their environment and to propagate are intelligent enough.
Stacey mifflin
The one who can't spell "dumbest".
YOU!!! are the Dumbest animal in the world...
Sheep
It may sound awkward;but,sharks happend to be the world's dumbest animal.
Jump out of a plane and land in a pit of sharks with lasers on their head. :)
The Smoking Gun Presents World's Dumbest - 2008 World's Dumbest Drivers 16 was released on: USA: February 2010
The Smoking Gun Presents World's Dumbest - 2008 World's Dumbest Partiers 10 was released on: USA: 22 July 2010
The Smoking Gun Presents World's Dumbest - 2008 World's Dumbest Performers 5 was released on: USA: 16 December 2010
The Smoking Gun Presents World's Dumbest - 2008 World's Dumbest 2 Dardevils was released on: USA: 16 December 2012
The Smoking Gun Presents World's Dumbest - 2008 World's Dumbest Drivers 20 was released on: USA: 21 October 2010
The Smoking Gun Presents World's Dumbest - 2008 World's Dumbest Performers 6 was released on: USA: 20 January 2011
The Smoking Gun Presents World's Dumbest - 2008 World's Dumbest Motorheads 2 was released on: USA: 9 June 2011
The Smoking Gun Presents World's Dumbest - 2008 World's Dumbest Motorheads 8 was released on: USA: 8 March 2013