Houston Zoo has a blog dedicated to baby elephant, Mac, who was born October 1, 2006. At birth, he weighed 384 pounds, measured 40 inches from his head to his rump, and stood 40 inches tall. When Mac was born on October 1st, he already weighed 384 pounds—the biggest Asian elephant born in an AZA Zoo. His growth has continued and today he weighs 764 pounds! Here’s a weighty issue - when will he weigh 1,000 lbs?