Ten-year-old African elephant Callee opens his mouth for a drink as zoo staff hose down several elephants in their cage's pond at the Pittsburgh Zoo on Tuesday, July 6, 2010. Every day at 3 p.m., the elephants are hosed down to keep cool by zoo staff.
Trainer Taylor Guastella feeds Independence, a bald eagle at the Pittsburgh National Aviary, after his part in a flight show at the Aviary on Friday, May 11, 2012.
Chris Gaus, senior aviculturist, cleans off the display glass of the Pittsburgh National Aviary's penguin exhibit before a ceremony announcing that the two newest African Penguins at the Aviary would be named after Penguins head coach Dan Bylsma and his wife, Mary Beth, on Friday, March 21, 2014.
Handler Senevi Ratne watches as Thandi, a 20-year-old African elephant, pulls down branches in order to eat their leaves as the Pittsburgh Zoo and PPG Aquarium introduces three African elephants rescued from Botswana, Thandi, Seeni and Sukiri, at the Zoo's International Conservation Center in Somerset County on Tuesday, July 19, 2011.
Bill Peters of St. Clairsville, Ohio, holds his daughter Brooklyn, 1, up to pet Lewis, an 8-year-old, 17-foot-tall Masai giraffe, at the Pittsburgh Zoo's new interactive giraffe overlook on Friday, Aug. 29, 2014. This weekend the Zoo will allow visitors to pay $5 to take a photo with the giraffes.
Dr. Pilar Fish, left, director of veterinary medicine for the National Aviary, and Cathy Sloth, curator for the National Aviary, introduce a baby Linnaeus two-toed sloth which will become a part of the National Aviary's permanent collection after its arrival at the Voyager Jet Center at the Allegheny County Airport, on Monday, Feb. 8, 2016.
Animal technician Carol DaRold, left, stretches the wing of a juvenile red tail hawk while volunteer Julie Simon holds it at the Wildlife Worx Rehab Center in Youngwood, Pa. on Monday, Nov. 30, 2009. The hawk was readmitted to the center after being shot five weeks after it had been released.
A sand tiger shark at the Pittsburgh Zoo and PPG Aquarium swims overhead of people viewing from an underwater tunnel on Tuesday, Aug. 14, 2012.
Independence, a bald eagle at the Pittsburgh National Aviary, performs in a flight show on Friday, May 11, 2012.
The Pittsburgh Zoo and PPG Aquarium introduces three African elephants rescued from Botswana, Thandi, Seeni and Sukiri, at the Zoo's International Conservation Center in Somerset County on Tuesday, July 19, 2011.
Iceberg, the Pittsburgh Penguins mascot, interacts with Preston, an African Penguin from the National Aviary in Pittsburgh, as he walks on a table for children to see as The Mother's Hope Foundation hosts "Penguin Palooza" at Children's Hospital of UPMC in Lawrenceville.
Autumn Ellis, an education specialist for the Pittsburgh Zoo, shows a pancake tortois to students at the St. Malachy Elementary School in Kennedy Township as part of their "Radical Reptiles" program on Friday, Feb. 22, 2013.
An elephant interacts with tourists while being fed at Elephant Jungle Sanctuary in Chiang Mai, Thailand, on Aug. 28, 2016.
At one of the camps operated by Elephant Jungle Sanctuary in Chiang Mai, Thailand, an elephant walks down a path to the river on Aug. 28, 2016.
After feeding, the elephants and tourists march to a mud pit and apply mud to the elephants. The mud acts as a natural sunscreen for the animals.
Tourists help bathe elephants in the river.
An elephant submerges itself in the river.
Workers at Elephant Jungle Sanctuary in Chiang Mai, Thailand, play with one of the elephants on Aug. 28, 2016.