The only thing cuter than one newborn giraffe is two of them.

The twin reticulated giraffes, the only living set of giraffe twins in the United States, are now almost three weeks old after being born May 10 at the Natural Bridge Wildlife Ranch in New Braunfels, Texas.

Wasswa, the first-born female calf, weighed 95 pounds and was 4-and-a-half feet tall. Nakato, the second-born male calf, was slightly larger, weighing 125 pounds at 5-and-a-half feet tall.

At first, the ranch caretakers were worried the mother wouldn't have enough milk for two calves, but both twins are thriving.

"As twin births are rare, we had a concern that the mother would not be able to produce enough milk for both offspring," ranch veterinarian Dr. Kenny Patin said. "We wanted to take prudent measures to guard the twins' health."

The Natural Bridge Wildlife Ranch, a 400-acre animal preserve just outside San Antonio, is no stranger to baby giraffes. These twins were the 19 th and 20 th giraffes born at the ranch, which opened in 1984.

Carol, the twins' mother, born in 2005, was the 12 th giraffe born at the ranch.