The Bornean orangutan is listed as Endangered and numbers approximately 41,000, while the Sumatran orangutan is considered Critically Endangered with an estimated population of 7,500. A century ago, more than 230,000 orangutans likely roamed in the wild.
Making the world better, one answer at a time. If you go to the United States Postal Service web-stie, you will find that one US First class stamp ($0.42) will cover the cost to mail a letter that weighs up to 1 ounce, about 28.35 grams. Thus, the average weight of a letter is one ounce or less. If you go to the United States Postal Service web-stie, you will find that one US First class stamp ($0.42) will cover the cost to mail a letter that weighs up to 1 ounce, about 28.35 grams.  Minor edit?
First-Class Mail is a USPS trademark. 1  The minimum size for First-Class Mail is 5 inches long, 3-1/2 inches high and 0.007 inches thick. 2  The maximum size is 11-1/2 inches long, 6-1/8 inches high, and .75 inches thick. 3  The maximum weight for letters is 3.5 ounces.