Oregon Field Guide

Season 22, Episode 10

Season 22 Episode 2210 | 29m 15s

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.

Aired: 02/17/11

Rating: TV-G

Video has closed captioning.

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