Brookfield Zoo welcomed two newborn Amur leopards in April. The male cubs are scheduled to make their public debut in mid-July. 

Maxine, a bottlenose dolphin at Brookfield Zoo, died June 2 after suffering an acute bacterial infection, the zoo announced Tuesday. 

A set of proteins long used to evaluate the well-being of humans can also serve as a marker for the welfare of animals in zoos and aquariums, according to a new study. 

The latest member of Brookfield Zoo’s four-generation family of western lowland gorillas was born June 1, the third offspring of Koola, the newborn’s 23-year-old mother. 

Get a close-up look at 100 live eight-legged critters – aka arachnids – including spiders, scorpions, tarantulas and more at Brookfield Zoo.

Following a historic diagnostic procedure last month, Layla, a 2,300-pound eastern black rhinoceros, underwent life-saving surgery last week to relieve an infection.

Hoping to identify the source of an infection, veterinarians performed what is thought to be the first ever CT scan on a rhinoceros.

The 50-year-old gorilla was the zoo’s oldest animal. “Knowing it’s the right decision doesn’t make it hurt any less,” said Amy Roberts, curator of mammals for the Chicago Zoological Society.

One year after welcoming its first baby reindeer in nearly four decades, Brookfield Zoo added another newborn fawn this week.

The yet-to-be-named chick is healthy and being hand-reared by animal care staff, the zoo said this week.

St. Patrick’s Day festivities kicked off a day early at Brookfield Zoo last week, where seals, camels, lemurs, orangutans and gorillas got shamrock-shaped and green-colored treats.

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

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

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

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.