Small waterfalls called headcuts gouge stream channels ever deeper as they move upstream. The variety and vigor of the insects that biologist Sam Testa collects will reflect the level of environmental harshness or pollution in this stream | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / USDA |
Taille de l’image : | 1812 px × 2700 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : |
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