Supplementary videos

Ants protecting aphids from 7-spotted ladybeetle 0:45 - 2:00
Cowbird brood parasitism: as seen from nestcam
Pearlfish and sea cucumber: a commensal relationship?

Extra credit readings

• The Decline of Eastern Songbirds Birds of Stanford
• Intracellular symbioses in insects U. of York
• Parasite Infection May Benefit Multiple Sclerosis Patients ScienceDaily 1/18/07
• Wildland Fire in Yellowstone Yellowstone National Park 12/22/04

Additional material

• Energy Flow

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