The thing that troubles me is that maybe I have miscalculated the body mass of my Aylar species, in particular the males, so I have researched a little about the mass of other imaginary species:

According to wikia sites, the Na'vi creatures from the

*Avatar*movie stand 3 meters tall and weigh 210 kilograms. The Wookiees' average height and mass are given as 2.1 meter and 125 kilograms, while the 1m-tall Ewoks are supposed to weigh 50kg.

In my case, the average female Aylars stand 5'8'' tall and have a body mass of 133 pounds.

The problem is that the males of the Aylar species stand 3.7m tall (around 12'3'') and I have calculated their weight as 720 kilograms, approximately equivalent to 1600 pounds. They are human-like in shape, except that they have a long, wolf-life tail that needs to be taken into consideration.

Is that too heavy for a creature that size?

My belief is that if a creature's size is multiplied by two then the weight should be multiplied by eight... Is that correct? How do you calculate the body mass of your Fantasy creatures??