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PODCAST

Earth Notes

KNAU Arizona Public Radio

Earth Notes, KNAU’s weekly environmental series, explores the Colorado Plateau by telling stories of the intricate relationships between environmental issues and our daily lives. Rooted in science and wrapped in human interest, the two-minute-long segments encourage listeners to think of themselves as part of the solution to environmental problems.

science nature

All Episodes

2:00

Earth Notes: Cottonwood Leaf Cooling

Earth Notes ·

2026/02/25

Fremont cottonwoods form a ribbon of green along Arizona’s rivers and streams. They have heart-shaped leaves which turn golden in fall and fluffy, cotton-like seeds.

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2:00

Earth Notes: Signs of Passage on Route 66

Earth Notes ·

2026/02/18

Route 66 is known for roadside history, but the landscape also holds older signs of passage and human movement.

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2:00

Earth Notes: Why Night Lighting Draws Winged Insects

Earth Notes ·

2026/02/11

Artificial light including flames have been known to attract moths and many other flying insects at night for centuries. Earliest written records of the behavior date back to the Roman Empire.

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2:00

Earth Notes: The Ghostly Glow of Gegenschein

Earth Notes ·

2026/02/04

If you look toward the eastern horizon just before dawn on a clear, moonless night, you should see a ghostly white glow shining up through the dark sky.

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2:00

Earth Notes: Coyote-Badger Cooperative Hunting

Earth Notes ·

2026/01/28

Coyotes and badgers are well-known predators of the American wilderness. What is not well known is that these two species, normally competing for the same prey, sometimes become hunting partners.

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2:00

Earth Notes: The Future of Saguaros

Earth Notes ·

2026/01/21

Saguaro survival is now being challenged at all elevations by climate change.

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2:00

Earth Notes: Ancestral Pueblo Water Conservation

Earth Notes ·

2026/01/14

Ancestral Puebloan peoples developed ingenious methods to collect, store, conserve, and utilize water.

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2:00

Earth Notes: Climate Clues in a Grand Canyon Cave

Earth Notes ·

2026/01/07

The marvels of the Grand Canyon extend beyond its dramatic scenery. Underground, vast cave systems hold clues to the region’s future climate.

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2:00

Earth Notes: Turkey Feather Blankets in the Ancient...

Earth Notes ·

2025/12/31

Ancestral Pueblo people began making turkey feather blankets about 1,800 years ago, coinciding with the transition to settled agricultural life.

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2:00

Earth Notes: The Surprising Story of House Finches

Earth Notes ·

2025/12/24

House finches, with their brown-streaked plumage and stout conical beaks, are such a common sight we often take them for granted.

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2:00

Earth Notes: Cactus Microchips

Earth Notes ·

2025/12/17

Some things can only be found if you know exactly where to look. The Peebles Navajo Cactus, at less than 3 centimeters tall, doesn’t seem to want to be found. Its thorny spines mimic surrounding grit so closely, it nearly disappears into the sand.

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2:00

Earth Notes: Aeroecology of Condors

Earth Notes ·

2025/12/10

A new study on the condor has revealed fundamental new insights into the lives of these critically endangered bird of prey.

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2:00

Earth Notes: Non-Toxic Rodent Control

Earth Notes ·

2025/12/03

As winter sets in, rodents seek warmth and food — often in our homes. There are non-toxic ways to control them, from rodent birth control to attracting natural predators.

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2:00

Earth Notes: Chino Valley’s Fred Harvey Farm

Earth Notes ·

2025/11/26

A historic Chino Valley farm that supported Fred Harvey’s railroad dining empire over a century ago is on track to become part of a new state park.

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2:00

Earth Notes: The Hartley Mammoth Site

Earth Notes ·

2025/11/25

In 2013, hiker Gary Hartley stumbled upon the fossilized remains of two mammoths in the Rio Puerco Canyon on the Colorado Plateau in northern New Mexico.

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2:00

Earth Notes: Clovis Culture and Megafauna

Earth Notes ·

2025/11/12

The Clovis people hunted mammoths and other Ice Age giants more than 13,000 years ago. Archaeologists are uncovering what happened when those animals disappeared.

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2:00

Earth Notes: Clovis Culture

Earth Notes ·

2025/11/05

The Clovis people hunted mammoths across the Southwest more than 13,000 years ago. Archaeologists are still uncovering what their tools and camps reveal.

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2:00

Earth Notes: Spiders That Hear Through Their Webs

Earth Notes ·

2025/10/29

Some spiders don’t just spin webs — they listen through them. Researchers found that orb-weavers can sense vibrations on their silk to detect prey and danger.

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2:00

Earth Notes: Witches' Broom

Earth Notes ·

2025/10/22

On a walk through the woods, you might see a strange-looking growth up in the branches of a tree. It’s called witches’ broom.

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2:00

Earth Notes: Mexican Spotted Owls & Changing Landscapes

Earth Notes ·

2025/10/15

Woodlands in western North America are changing fast. The Mexican Spotted Owl is an emblematic, threatened species that feels the effects of these transitions.

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94 results

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