In a production facility, labor and material costs are usually variable costs that increase as the volume of production increases. It takes more labor and material to produce more output, so the cost of labor and material varies in direct proportion to the volume of output.
The harpy eagle's name comes from. the harpies of Greek mythology which were ferocious winged creatures with sharp claws, a woman's face and a vulture's body. The average weight of a harpy eagle is 18.4 lbs (8.2 kg). Female harpy eagles are larger than the males. A female can weigh from 14 to 18 lbs (7-9 kg), while the males weigh 10 to 16 lbs (5-8 kg). Their body length is between 36 and 40 inches (1 meter). Their feathers are slate-black above and white to light gray underneath.
1 The harpy eagle lays two eggs, one egg is referred to as a âback upâ in case something happens to the first egg, or it fails to hatch. 2  It takes an egg 56 days to hatch, and the young eagles are able to walk and stand after 36 days.  Harpy eagles swoop at speeds of up to 50 miles per hour.