CNN - Busch Gardens Tampa has two new bundles of joy in their serengeti plain habitat.

The two giraffe calves, a male and female, were born last month.

The female calf weighs 145 pounds and stand at about 5'8". The male weighs 188 pound sand is more than six feet tall.

Within an hour of the birth, they were standing and within two hours they were nursing.

Giraffes are the tallest mammals on earth and can grow up to 18 feet tall.