There's a new mom on the block at the Denver Zoo.Hesty, the zoo's 15-year-old Sumatran orangutan, gave birth to a healthy baby boy May 24, the zoo announced Saturday.The zoo calls the birth "especially exciting" and "a huge conservation win" for the critically endangered species. Hesty herself was born at the zoo back in 2010, and had what the zoo said was a difficult start after birth, needing support from staff for several weeks before being r…