Air date: 1990-09-30

Runtime: 53 min

Sharks, rays, squids and blue whales live in the Pacific Ocean off the California coast.

Air date: 1990-10-07

Runtime: 53 min

Three species of monkeys, the muriqui, the golden lion tamarin and the buffy-headed marmoset struggle for survival in Brazil's coastal Atlantic Forest.

Air date: 1990-10-14

Runtime: 53 min

A look at how Norway and Sweden are affected by eight months of winter.

Air date: 1990-10-21

Runtime: 53 min

A look at the Swedish archipelago and Norway's fjords.

Air date: 1990-11-11

Runtime: 53 min

Africa's spotted hyena is a matriarch dominated, efficient predator.

Air date: 1990-11-18

Runtime: 53 min

Sight and sound are experienced through animal eyes and ears.

Air date: 1990-11-25

Runtime: 53 min

Enhanced olfactory sensitivity; unique animal senses.

Air date: 1990-12-02

Runtime: 53 min

Internal clocks guide life rhythms of eating, sleeping, mating, hibernation, birth and death.

Air date: 1990-12-09

Runtime: 53 min

This program travels to the island of Cayo Santiago off Puerto Rico to study the behavioral patterns of a colony of feral Rhesus Macaques.

Air date: 1990-12-16

Runtime: 53 min

Rangers at Denali National Park in Alaska train hikers for planned encounters with grizzlies; Alaskan grizzly bears are seen salmon fishing at Brooks Falls.

Air date: 1991-01-13

Runtime: 53 min

Penguins, maras, guanacos, sea lions and killer whales highlight this portrait of Patagonia.

Air date: 1991-02-17

Runtime: 53 min

In light of the Persian Gulf War and the recent oil spills, PBS airs an update of the 1984 episode of Nature, Treasures of the Gulf, that focused on the effects of the Iran-Iraq war on the fragile ecology of the Persian Gulf.

Air date: 1991-02-24

Runtime: 53 min

The beauty of the African plains and the effects of tourism on the area.

Air date: 1991-03-03

Runtime: 53 min

Filmmaker Simon Trevor, a former game warden, records the decimation of African elephants.

Air date: 1991-03-10

Runtime: 53 min

The natural and human history of the Grand Tetons and Jackson Hole, Wyoming.

Air date: 1991-03-17

Runtime: 53 min

Life within a close-knit golden jackal family on the plains of Lemuta in Africa.

Air date: 1991-03-24

Runtime: 53 min

Biologist Lynn Rogers follows the black bear out of hibernation and into the Minnesota woods.

Air date: 1991-04-07

Runtime: 53 min

The relationship within a wild dog pack on Africa's Serengeti Plains.

Air date: 1991-04-14

Runtime: 53 min

A profile of the albatross examines its traits and habitats, as well as the mysteries and myths surrounding it.

Air date: 1991-04-28

Runtime: 53 min

A polecat winters at a working farm in Wales, along with scavenging foxes, rats and birds.

Air date: 1991-05-12

Runtime: 53 min

Grizzlies, wolves and cougars roam Montana's rugged, pristine Glacier National Park.