A greater one-horned rhino named Tashi, just gave birth to a 123.5 pound baby rhino after a 488-day pregnancy, according to the Buffalo Zoo.

The zoo announced the birth of the male rhino calf on Wednesday, June 19, on its Facebook page.

“The zoo animal care team report mom and baby are bonding and doing well. This birth is very special and important for the future of the species — this is only the third successful birth of a greater one-horned rhino via artificial insemination,” the post reads.

“This is only the third successful birth of a greater one-horned rhino via artificial insemination. Tashi’s third calf, Monica was the first and the second was born recently at Zoo Miami. This birth is Tashi’s fourth calf!” according to The Buffalo Zoo.

Tashi and her baby calf will remain behind the scenes at the Buffalo Zoo as the animal care and veterinary teams continue to monitor their progress.

This is Tashi’s fourth calf, so this 15-month pregnancy is nothing new for her. It’s also natural for greater one-horned rhinos to be pregnant for that long.

The greater one-horned rhinos used to be endangered and on the IUCN Red List, but due to “conservation efforts,” their status has been changed from endangered to vulnerable.

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“This birth is very special and important for the future of the species,” the Buffalo Zoo’s post reads.