The Bronx Zoo got two new additions this spring: a pair of baby gorillas. One was born on March 10, the other on April 17. Though they have two different mothers, Julia and Tuti, they share the same father, Ernie. Zookeepers haven’t determined the sex of the two babies yet because they have not been able to get close enough to examine them, the New York Daily News reports.
Newborn gorillas weight between 4 and 5 pounds, though they will grow to be between 350 and 450 pounds if male or 150 to 250 pounds if female.
The babies are the first newcomers to the zoo’s Congo Gorilla Forest in eight years. Western lowland gorillas, native to equatorial Africa, are critically endangered.
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Write to Eliana Dockterman at eliana.dockterman@time.com