VOORHEES, N.J. (CBS) — One kitten in New Jersey is a genetic anomaly.

Dr. Erin Henry, a veterinarian at the Animal Welfare Association in Voorhees, discovered that a 3-week-old orange and black tortoiseshell kitten named Burrito was a boy.

READ MORE: IBEW Local 98 Union Leader John Dougherty Arrested By Federal Authorities At Philadelphia Home

Only one in 3,000 of those types of cats are male, according to a 2012 study by the College of Veterinary Medicine at the University of Missouri.

Teen Takes Harvard Acceptance Letter To Prom

“When I turned little Burrito over I was so surprised,” said Henry. “I’ve examined thousands of kittens while working at AWA and they are so rare that he may be the only male tortoiseshell I’ll ever see again.”

READ MORE: FEMA-Run Mass COVID-19 Vaccination Site Opens At Pennsylvania Convention Center

According to the Animal Welfare Association, a cat’s orange and black fur is dictated by the X chromosome. Females have two X chromosomes, while males have an XY combination, which means that only female cats can have that color fur. However, to be a male tortoiseshell cat, he must have two X chromosomes and one Y.

NJ Twin Sisters Give Birth On Same Day

Cats born with the extra sex chromosome don’t have developmental issues, but they tend to be sterile.

MORE NEWS: Cell Phone Video Captures 4-Alarm Blaze At Howard Johnson Hotel In Blackwood

Burrito will be put up for adoption when he’s 8 weeks old.