The number 1 animal in the world is the ant because of their vast numbers across the world and the large sizes of the ant colonies.
When considering mammals the number 1 animal is humans which are the most populous species on earth.
While not everyone thinks of humans as animals we are in fact part of the animal species.
The number 1 smartest animal besides humans are chimpanzees.
Chimpanzees are a species of great ape native to the forests and savannahs of tropical Africa. It has four confirmed subspecies and a fifth proposed one.
The average lifespan of a chimpanzee is around 32 years.
It is estimated that there are approximately 170,000-300,000 chimpanzees left in the wild, but some populations, such as the Nigeria-Cameroon chimpanzee, are down to as few as 6,000 individuals.
While a chimpanzee can likely lift or pull around 150 to 200 pounds (68 to 91 kilograms), which is still impressive given their size, lifting much heavier objects directly off the ground is not something the chimpanzee could realistically do.
Humans however are often better at lifting heavy weights in a controlled manner.