"In environmental enrichment, because you're pretty much changing the animals' environment, the goal is to increase animals' choices added to the environment," said Marcie Tarvid, curator of behavioral husbandry.
"It has many benefits.
It gets them physically active and hopefully mentally active too."
Zookeepers will place items in their habitats, such as papier-mache puzzles and blood or fruit flavored ice on a stick.
"It's like a task, something that gets them moving and going," Tarvid
"We'll freeze something, like fruitcicles for the zebras and gazelles, and they can go out and lick them.
For the lion cubs, we'll have papier-mache animals, and the birds might get live fish or a cricket or grasshopper."
said the enrichment items are not simply treats for the animals.
"We're always really careful about what we
use. We're not going to feed and animal with a small amount of sugar in their diet something high in calories," she
"Even though it's a fun day for them, a lot of what they're getting is in their normal diets."
Enrichment day is a good day for people to understand their own pets a little better, too.
"It's a great way for people just to think about what they can give their animals at home," Tarvid