* Average Length: 8 to 13 feet
* Average Weight: 800 to 1,200 pounds
Factors influencing size:
* Species: West Indian manatees tend to be slightly smaller than Amazonian manatees.
* Sex: Male manatees are generally smaller than females.
* Age: Manatees continue to grow throughout their lives, with older individuals reaching larger sizes.
* Diet and Environment: Access to food and environmental factors can influence a manatee's growth and size.
It's important to note that these are just averages, and individual manatees can vary greatly in size.