The zoo welcomed the birth of Dobby, the name given to the male calf, on Tuesday.
Kipele was born at Denver Zoo in August 1993, and is the oldest of the zoo's giraffes.
During the first two years of a giraffe's life, it doubles its height to be nearly 12-feet tall.
Staff at the Denver Zoo had no idea their 23-year-old giraffe named Kipele was pregnant until very recently - in addition to being zoo's oldest giraffe, she was also on birth control at the time of her impregnation.
Meanwhile, in Animal Adventure Park in Harpursville, N.Y., April is going about her business watched by hundreds of thousands of people on the zoo's live video stream. The feed has totaled more than 15 million views on YouTube as people around the world check on April's condition.
April changed some of her behaviors overnight; she's choosing new spots to stand and sleep and going off her usual naptime routine, the Animal Adventure Park said in a Facebook post Friday.
More than 100,000 people are now watching a livestream of a giraffe giving birth.
The privately owned zoo's giraffe cam began live-streaming video from April's enclosure last week.
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Baby giraffe Dobby is being monitored closely by both Denver and Cheyenne Mountain Zoo officials after tests showed a lack of infection-fighting proteins in the calf.
Apparently giraffe births are all the rage.
Veterinarians confirmed Kipele was pregnant and her due date was close.
Baby giraffe receives plasma.
Even Animal Adventure Park have joined in with the fun, sharing a picture of April's swollen belly with the caption: "Move over Beyonce - there is a new bump in town!" "The fact that you're gonna get to witness the miracle of birth from an animal that you really don't get to see give birth - that's neat".
April's gestation period will have taken 15 months.
One viewer commented on the zoo's Facebook page that she had been watching the giraffe for a whole week.