A pair of four-month-old white lion cubs play in their en...

The National
  • A pair of four-month-old white lion cubs play in their enclosure at the Altiplano Zoo in Tlaxcala, Tuesday, Aug. 7, 2018. The zoo is holding a naming contest for them and the zoo's director Cesar Toriz hopes that in a few years they can find them mates. (AP Photo/Rebecca Blackwell)
    A pair of four-month-old white lion cubs play in their enclosure at the Altiplano Zoo in Tlaxcala, Tuesday, Aug. 7, 2018. The zoo is holding a naming contest for them and the zoo's director Cesar Toriz hopes that in a few years they can find them mates. (AP Photo/Rebecca Blackwell)
  • A pair of four-month-old white lion cubs lick the leg of a camera tripod during a visit by Associated Press journalists, inside their enclosure at the Altiplano Zoo in Tlaxcala, Tuesday, Aug. 7, 2018. The Zoo, about two hours east of Mexico City, has welcomed the two white lion cubs born in March and recently presented to the public.(AP Photo/Rebecca Blackwell)
    A pair of four-month-old white lion cubs lick the leg of a camera tripod during a visit by Associated Press journalists, inside their enclosure at the Altiplano Zoo in Tlaxcala, Tuesday, Aug. 7, 2018. The Zoo, about two hours east of Mexico City, has welcomed the two white lion cubs born in March and recently presented to the public.(AP Photo/Rebecca Blackwell)
  • A pair of four-month-old white lion cubs play together in their enclosure at the Altiplano Zoo in Tlaxcala, Tuesday, Aug. 7, 2018. The Zoo, about two hours east of Mexico City, has welcomed the two white lion cubs born in March and recently presented to the public.(AP Photo/Rebecca Blackwell)
    A pair of four-month-old white lion cubs play together in their enclosure at the Altiplano Zoo in Tlaxcala, Tuesday, Aug. 7, 2018. The Zoo, about two hours east of Mexico City, has welcomed the two white lion cubs born in March and recently presented to the public.(AP Photo/Rebecca Blackwell)
  • A girl locks eyes with one of a pair of four-month-old white lion cubs, through a fenced entrance gate to the cubs' enclosure at the Altiplano Zoo in Tlaxcala, Tuesday, Aug. 7, 2018. White lions are a rarity unique to an endemic region in South Africa. (AP Photo/Rebecca Blackwell)
    A girl locks eyes with one of a pair of four-month-old white lion cubs, through a fenced entrance gate to the cubs' enclosure at the Altiplano Zoo in Tlaxcala, Tuesday, Aug. 7, 2018. White lions are a rarity unique to an endemic region in South Africa. (AP Photo/Rebecca Blackwell)
  • One of a pair of four-month-old white lion cubs bites the pants of veterinarian Rodrigo Gutierrez Zecua as the cubs play inside their enclosure at the Altiplano Zoo in Tlaxcala, Tuesday, Aug. 7, 2018. White lions are a rarity unique to an endemic region in South Africa. (AP Photo/Rebecca Blackwell)
    One of a pair of four-month-old white lion cubs bites the pants of veterinarian Rodrigo Gutierrez Zecua as the cubs play inside their enclosure at the Altiplano Zoo in Tlaxcala, Tuesday, Aug. 7, 2018. White lions are a rarity unique to an endemic region in South Africa. (AP Photo/Rebecca Blackwell)
  • One of a pair of four-month-old white lion cubs snarls as they play together in their enclosure at the Altiplano Zoo in Tlaxcala, Tuesday, Aug. 7, 2018. Cesar Toriz, the zoo's director, says the cubs' mother rejected them so they had to be bottle fed formula for their first couple months. (AP Photo/Rebecca Blackwell)
    One of a pair of four-month-old white lion cubs snarls as they play together in their enclosure at the Altiplano Zoo in Tlaxcala, Tuesday, Aug. 7, 2018. Cesar Toriz, the zoo's director, says the cubs' mother rejected them so they had to be bottle fed formula for their first couple months. (AP Photo/Rebecca Blackwell)
  • One of a pair of four-month-old white lion cubs rests inside the cubs' enclosure at the Altiplano Zoo in Tlaxcala, Tuesday, Aug. 7, 2018. The zoo's director Cesar Toriz says the cubs are gaining weight, now about 44 pounds and 23 inches long and eat chicken and milk. (AP Photo/Rebecca Blackwell)
    One of a pair of four-month-old white lion cubs rests inside the cubs' enclosure at the Altiplano Zoo in Tlaxcala, Tuesday, Aug. 7, 2018. The zoo's director Cesar Toriz says the cubs are gaining weight, now about 44 pounds and 23 inches long and eat chicken and milk. (AP Photo/Rebecca Blackwell)