There were certainly no tricks at the National Zoo and Aquarium, with animals chowing down on Halloween-themed treats on Thursday.
However, the zoo's residents were made to work for their treats, having to get them out of special jack-o-lanterns and buckets.
The treats inside were far from the lollies and chocolates seen in most Halloween goodie bags, which included food such as meal worms, fly pupae and fruit and vegetables, depending on the species.
Some of the animals were able to get the treats easier than others, with the capuchin monkeys and meerkats able to burrow in through the pumpkin's carved eyes and mouth.
For the larger species, like tigers and bears, they resorted to breaking open the pumpkins to reach their tasty snacks.
General manager at the zoo, Renee Nasserpour, said the Halloween treats were all about giving the animals enrichment.
"For us at the zoo, Halloween isn't just for the humans, the animals enjoy it as well," Ms Nasserpour said.
"They definitely love all of those hidden treasures tucked away inside Halloween festive items."
The Halloween treats at the zoo are part of a broader enrichment program at the zoo, rewarding animals with food they would find in the wild.
Ms Nasserpour said the animals are provided enrichment on a daily basis, often in different ways such as with food and toys.
"They get quite a thrill out of the items," she said.
"The items change so it creates mental and physical stimulation for them and it's something challenging."
