Boa constrictors grow up to 3 meters in length, with females being larger than males.
The average size of females varies between 2.1 and 3 meters and males between 1.8 and 2.4 meters.
Females weigh between 10 and 15 kg. The largest boa constrictors exceed 45 kilograms.
The sperm whale’s brain is the largest in the world, five times the size of a human brain.
It is the largest known brain of any modern or extinct animal, weighs on average about 7-8 kilograms, and has a volume of about 8000 cubic centimeters.