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In this March 13, 2019 photo provided by the Louisiana Department of Wildlife and Fisheries, and taken by a trail cam, biologist Eva Szyszkoski uses brooms to fend off a pair of nesting whooping cranes, so biologist Sara Zimorski, right, can replace a data logging egg with the cranes' real egg in Jefferson Davis, La. Spy eggs may help Louisiana biologists learn why some whooping crane chicks die in the egg, while others hatch. State biologists swap egg-shaped data loggers for one of the two eggs that many cranes lay. The real eggs are incubated at Audubon Nature Institute until they’re nearly ready to hatch. Then biologists swap them back. The fakes give up their data through an infrared connection. (Louisiana Department of Wildlife and Fisheries via AP)

In this March 13, 2019 photo provided by the Louisiana Department of Wildlife and Fisheries, and taken by a trail cam, biologist Eva Szyszkoski uses brooms to fend off a pair of nesting whooping cranes, so biologist Sara Zimorski, right, can replace a data logging egg with the cranes' real egg in Jefferson Davis, La. Spy eggs may help Louisiana biologists learn why some whooping crane chicks die in the egg, while others hatch. State biologists swap egg-shaped data loggers for one of the two eggs that many cranes lay. The real eggs are incubated at Audubon Nature Institute until they’re nearly ready to hatch. Then biologists swap them back. The fakes give up their data through an infrared connection. (Louisiana Department of Wildlife and Fisheries via AP)

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