Place in the oven and roast for 1 1/2 hours, or 30 minutes per pound. 7. Test the roast to make sure it's done. Remove the lid or foil from the pan and insert a meat thermometer into the roast.1  Rare meat is done when its temperature has reached 125 degrees Fahrenheit(52 degrees Celsius).lace in the oven and roast for 1 1/2 hours, or 30 minutes per pound. 7. Test the roast to make sure it's done. Remove the lid or foil from the pan and insert a meat thermometer into the roast. 1  Rare meat is done when its temperature has reached 125 degrees Fahrenheit(52 degrees Celsius).
The eastern lowland gorilla has a black color. The mountain gorilla is black like the eastern lo â¦ wland gorilla, but the hair is longer. The adult male who controls the group develops silver hairs on his back, thus the name silver-back. 12 people found this useful.
Adult male gorillas have silvery white saddles that inspired the name silverback for these animals. Generally, the mountain gorilla has longer hair than the other subspecies. Western lowland gorillas have a more pronounced brow ridge, and ears that appear small in relation to their heads.