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Christie Wildcat, middle, wearing her sloth costume, takes a picture of Aspen, a Linnaeus脮s two-toed sloth, during a special meet and greet at the Denver Downtown Aquarium on February 25, 2018 in Denver, Colorado. With her are her friends Maddy Killian, to her left, and Kelsey Frymire, right. The three drove all the way from Laramie at 1:00 in the morning to get the opportunity to see Aspen. The aquarium offers this special, once-a-year event for the first 100 people to sign up. Many people turned up before dawn to get in line with one teenager and his mother setting up camp at 11:00 pm the night before to make sure to be the first in line. The featured guest was Aspen a 7 year old Linnaeus脮s two-toed sloth. These animals can live 10-15 years in the wild and sometimes up to 40 years in captivity. (Photo by Helen H. Richardson/The Denver Post)

Animal caretaker Kevin Kron, with just arm showing right, offers lettuce to Aspen, a 7 year old Linnaeus脮s two-toed sloth, during a special meet and greet at the Denver Downtown Aquarium on February 25, 2018 in Denver, Colorado. The aquarium offers this special, once-a-year event for the first 100 people to sign up. Many people turned up before dawn to get in line with one teenager and his mother setting up camp at 11:00 pm the night before to make sure to be the first in line. The featured guest was Aspen a 7 year old Linnaeus脮s two-toed sloth. These animals can live 10-15 years in the wild and sometimes up to 40 years in captivity. They live predominantly in rainforest regions of the world in South America. They are found in Venezuela, the Guyanas, Colombia, Ecuador, Peru, and Brazil north of the Amazon River. (Photo by Helen H. Richardson/The Denver Post)

Kyle Coy, left, and Hannah Lovell, middle, get a photo taken of themselves with Aspen, right, a Linnaeus脮s two-toed sloth, during a special meet and greet at the Denver Downtown Aquarium on February 25, 2018 in Denver, Colorado. The aquarium offers this special, once-a-year event for the first 100 people to sign up. Many people turned up before dawn to get in line with one teenager and his mother setting up camp at 11:00 pm the night before to make sure to be the first in line. The featured guest was Aspen a 7 year old Linnaeus脮s two-toed sloth. These animals can live 10-15 years in the wild and sometimes up to 40 years in captivity. They live predominantly in rainforest regions of the world in South America. They are found in Venezuela, the Guyanas, Colombia, Ecuador, Peru, and Brazil north of the Amazon River. (Photo by Helen H. Richardson/The Denver Post)

Audri Mata takes a "Slothie" with Aspen, right, a Linnaeus脮s two-toed sloth, during a special meet and greet at the Denver Downtown Aquarium on February 25, 2018 in Denver, Colorado. The aquarium offers this special, once-a-year event for the first 100 people to sign up. Many people turned up before dawn to get in line with one teenager and his mother setting up camp at 11:00 pm the night before to make sure to be the first in line. The featured guest was Aspen a 7 year old Linnaeus脮s two-toed sloth. These animals can live 10-15 years in the wild and sometimes up to 40 years in captivity. They live predominantly in rainforest regions of the world in South America. They are found in Venezuela, the Guyanas, Colombia, Ecuador, Peru, and Brazil north of the Amazon River. Mata drove all the way from Cheyenne, Wyoming to be at the meet and greet. (Photo by Helen H. Richardson/The Denver Post)

Gabi Lukasik, Abbey McWhirter, and Ever Larson {cq}, all 15, have their photos taken with Aspen, right, a Linnaeus脮s two-toed sloth, during a special meet and greet at the Denver Downtown Aquarium on February 25, 2018 in Denver, Colorado. The aquarium offers this special, once-a-year event for the first 100 people to sign up. Many people turned up before dawn to get in line with one teenager and his mother setting up camp at 11:00 pm the night before to make sure to be the first in line. The featured guest was Aspen a 7 year old Linnaeus脮s two-toed sloth. These animals can live 10-15 years in the wild and sometimes up to 40 years in captivity. They live predominantly in rainforest regions of the world in South America. They are found in Venezuela, the Guyanas, Colombia, Ecuador, Peru, and Brazil north of the Amazon River. (Photo by Helen H. Richardson/The Denver Post)

Max Burton, 9, looks back at Aspen, right, a Linnaeus脮s two-toed sloth, while getting his photo taken during a special meet and greet at the Denver Downtown Aquarium on February 25, 2018 in Denver, Colorado. The aquarium offers this special, once-a-year event for the first 100 people to sign up. Many people turned up before dawn to get in line with one teenager and his mother setting up camp at 11:00 pm the night before to make sure to be the first in line. The featured guest was Aspen a 7 year old Linnaeus脮s two-toed sloth. These animals can live 10-15 years in the wild and sometimes up to 40 years in captivity. They live predominantly in rainforest regions of the world in South America. They are found in Venezuela, the Guyanas, Colombia, Ecuador, Peru, and Brazil north of the Amazon River. (Photo by Helen H. Richardson/The Denver Post)

Guests were given the opportunity to take a "Slothie", or selfie, with Aspen, right, a Linnaeus脮s two-toed sloth, during a special meet and greet at the Denver Downtown Aquarium on February 25, 2018 in Denver, Colorado. The aquarium offers this special, once-a-year event for the first 100 people to sign up. Many people turned up before dawn to get in line with one teenager and his mother setting up camp at 11:00 pm the night before to make sure to be the first in line. The featured guest was Aspen a 7 year old Linnaeus脮s two-toed sloth. These animals can live 10-15 years in the wild and sometimes up to 40 years in captivity. They live predominantly in rainforest regions of the world in South America. They are found in Venezuela, the Guyanas, Colombia, Ecuador, Peru, and Brazil north of the Amazon River. Mata drove all the way from Cheyenne, Wyoming to be at the meet and greet. (Photo by Helen H. Richardson/The Denver Post)

John Clairborne, left, and Lyra Holmes, middle, take a "Slothie" (or selfie) with Aspen, right, a Linnaeus脮s two-toed sloth, during a special meet and greet at the Denver Downtown Aquarium on February 25, 2018 in Denver, Colorado. The aquarium offers this special, once-a-year event for the first 100 people to sign up. Many people turned up before dawn to get in line with one teenager and his mother setting up camp at 11:00 pm the night before to make sure to be the first in line. The featured guest was Aspen a 7 year old Linnaeus脮s two-toed sloth. These animals can live 10-15 years in the wild and sometimes up to 40 years in captivity. They live predominantly in rainforest regions of the world in South America. They are found in Venezuela, the Guyanas, Colombia, Ecuador, Peru, and Brazil north of the Amazon River. Photo by Helen H. Richardson/The Denver Post)