The complex expressiveness of humankind's closest relative in the animal kingdom is the topic of a photographic exhibit, "The Chimpanzees of Gombe Stream," showing through April 28 at the Utah Museum of Natural History.

The exhibit consists of 30 photographs taken by wildlife photographer Hugo Van Lawick for the National Geographic Society. They capture the behavior and individual personalities of the chimpanzees that have been the subject of 25 years of field research for National Geographic, led by naturalist Jane Goodall.Van Lawick also documents the major themes of the research itself, and the threat that deforestation poses to survival of the chimps.

The exhibit is distributed by the James Ford Bell Museum of Natural History at the University of Minnesota for the National Geographic Society.

The photographs will show in the museum's Ezekiel R. and Katherine W. Dumke Gallery. The museum is located at the 200 South entrance to the University of Utah campus. Hours are 9:30 a.m. to 5:30 p.m., Monday through Friday, and noon to 5 p.m. on Sunday.