NEW YORK (CBSNewYork) – They’re not blowing your horn.

Two southern white rhinos are making their debut at the Bronx Zoo.

The two rhinos are brothers and weigh about 4,000 pounds. They’re still growing and are expected to weigh about 7,000 pounds as adults.

Of the five rhino species in the world, only white rhinos are not endangered. However they do face a threat from poaching for their horns. The horns, by the way, are made of keratin, which is the same substance that makes up hair and nails.

For more information check out the Bronx Zoo’s website, or the Wildlife Conservation Society.

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(credit: Julie Larsen Maher © WCS)

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