JIM WEST / SCIENCE PHOTO LIBRARY JIM WEST / SCIENCE PHOTO LIBRARY
Bags placed over milkweed (Asclepias sp.) plants to collect their seeds in a tallgrass prairie in the Neal Smith National Wildlife Refuge, Prairie City, Iowa, USA. This refuge preserves the tallgrass prairie, which used to cover most of Iowa. Biologists collect the seeds of less common milkweed varieties and plant them in other areas of the refuge as part of their conservation efforts to bring back the tallgrass prairie.
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