Want to watch better-quality PBS Video? Sign in to access higher-quality streaming!

By signing in, you are authorizing PBS to share your email address with your local PBS station to send you periodic communications about station events, services and support. Any other uses of your information by PBS are governed by PBS’s Privacy Policy.

Closed Captioning Settings


Captions look like this

Captions size

  • 15

Captions font family

Edge style

Captions color

Background color

Window color

Text Opacity

  • 100%

Background Opacity

  • 100%

Window Opacity

  • 0%
  • Save Settings
  • Reset


Season 22, Episode 10

  • Aired: 02/17/2011
  • 29:15
  • Rating: TV-G
Crayfish Invasion - Eastern crayfish invade Oregon rivers through a surprise route. Lichen - Lichen can teaches us volumes about the quality of the air we breathe. Heritage Trees - Portland's Heritage Tree program recognizes and preserves trees with special significance. Working Dogs for Conservation - A conservation dog uses his amazing sense of smell to help a researcher find rare plants.
Embed Options
Close ×
Season 22, Episode 10 image
Season 22, Episode 10
Crayfish Invasion; Lichen; Heritage Trees; Working Dogs for Conservation
Please copy this text to your clipboard.
Problems Playing Video ?


Watch videos from your favorite PBS KIDS shows with the PBS KIDS Video app for your tablet or phone.

Downton Abbey Collection

Bring home the complete collection: DVDs, Blu-rays, books, gifts and more. Visit ShopPBS.


helps all of us explore new worlds and ideas. Give Now

Sponsored Links