William Mullen

When it comes to pets, few are more expensive than cute, doe-eyed, diapered infant monkeys that exotic animal dealers peddle over the Internet and through newspaper want ads from $1,800...

Through the windows of Brookfield Zoo's perching bird house, visitors can watch some of the last Guam kingfishers in the world and ponder a mystery that has stumped some of...

Increasingly, pedestrians in the Loop have been encountering disquieting bits of birds--a sparrow's wing here, a clump of feathers there--lying about on the sidewalks. Also, with more regularity, many a...

When the Shedd Aquarium opened its giant marine mammal pavilion, the Oceanarium, its chief trainer promised the public would have front-row seats to the drama of life in whale and...

In a single small display case holding several mechanical clocks, the Museum of Science and Industry has neatly encapsulated humanity's progressively more complicated relationship with one of its most basic...

Like somebody watching as the door to an overstuffed closet bulges from the pressure of too many coats, boots and umbrellas, Field Museum officials last week finally gave in to...

Early next year a teenage mother bear from Wichita, Kan., will fly to Chicago to meet a lonely, 24-year-old bachelor bear. The two were paired up by an international group...

Ramar, a 32-year-old gorilla who got his start in life as a star in a nightclub act and a brute who manhandled suitcases in a classic TV commercial for luggage,...

Several years ago, Lincoln Park Zoo had genetic testing done to find out why its king penguins--which, male or female, look like elegant butlers in tailed tuxedos--had never so much...

When Debbie, Lincoln Park Zoo's beloved but aging and decidedly butterball gorilla began showing signs of deteriorating health, keepers were faced with a significant problem in examining her. At 34...