Nora, a 4-year-old western lowland gorilla, eats a heart-shaped treat at Brookfield Zoo. (Jim Schulz / Chicago Zoological Society)

Date or no date, single or taken, animals at Brookfield Zoo experienced Valentine’s Day with the best kind of gift: food.

Chicago Zoological Society’s veterinary staff perform an emergency appendectomy on Ben, a 40-year-old orangutan at Brookfield Zoo. (Jim Schulz/Chicago Zoological Society)

Ben, a 40-year-old orangutan at Brookfield Zoo, underwent an emergency appendectomy last month after veterinary staff discovered a ruptured appendix. 

Brookfield Zoo veterinary staff monitor Zana, a 5-year-old Mexican wolf, during an artifical insemination procedure Feb. 4. (Courtesy Chicago Zoological Society)

Nearly 30 years ago, scientists began collecting semen samples from Mexican wolves. On Sunday, Brookfield Zoo artificially inseminated one wolf as part of an effort to boost the genetic health of the endangered species. 

Ramar, a 50-year-old western lowland gorilla, is the oldest animal at Brookfield Zoo. (Courtesy of Chicago Zoological Society)

Ramar, one of the oldest gorillas in the country, celebrated a milestone birthday this month with a frozen “cake” filled with fruit and raisins. 

A male gray seal was born at Brookfield Zoo on Dec. 26. (Jim Schulz / Chicago Zoological Society)

Brookfield Zoo welcomed a newborn gray seal on Dec. 26. The male pup weighed 36 pounds at birth and is expected to weigh more than 120 pounds by the time he is weaned at three weeks. 

Four specially-designed suction cups are used to attach a bio-logging device to the backs of bottlenose dolphins at Brookfield Zoo. (Alex Ruppenthal / Chicago Tonight)

Brookfield Zoo is leading a first-of-its-kind study to collect data from dolphins and other aquatic mammals using a Fitbit-like device that figures to revolutionize human understanding of the animals’ behavior.

(Courtesy Chicago Zoological Society)

From siblings with snowballs to wrestling chimpanzees, playful behavior is usually easy to spot. But the question of why we play – and whether we all play for the same reasons – is less apparent.

(Courtesy of One of a Kind Show)

Holiday markets, late-night shopping, jousting bouts and classic Christmas flicks usher in the weekend. Here are 10 things to do in and around Chicago.

(Mexican Wolf Interagency Field Team / Chicago Zoological Society)

A Mexican wolf pup born this spring at Brookfield Zoo and released into the wild as part of a species recovery program was tracked down in New Mexico and is healthy, the zoo announced this week.

(Courtesy Brookfield Zoo)

One of the oldest giraffes in a North American zoo died last week. At 27, she had surpassed the median life expectancy for giraffes, which is about 17-20 years.

(Jim Schulz / Chicago Zoological Society)

One of Brookfield Zoo’s newest tenants recently emerged from her mom’s pouch and can now be seen at the zoo’s Australia House.  

(Courtesy Chicago Zoological Society)

More than 125 animal welfare experts from around the world will gather in October to share new research and best practices related to caring for animals in zoos and aquariums.

(Courtesy Chicago Zoological Society)

The colorful bird who lived to the ripe old age of 83 had a global fan base and seemed to enjoy being the center of attention. A year after his death, Brookfield Zoo is set to unveil a statue in his honor.

Scores of triathletes, saganaki, fancy footwork, food trucks and global grapes usher in the weekend. Here are 10 things to do in and around Chicago.

(Jim Schulz / Chicago Zoological Society)

Zingo, the first black-crested mangabey born at the zoo, has light-colored skin that will darken over time. 

(Courtesy of Chicago Zoological Society)

Sample more than 80 beers while taking in the zoo’s wildlife and nature at the sixth annual event.