Migrating animals have for a long time been tracked by recapturing tagged individuals. More recently, radio-telemetry, which requires an observer to physically follow the tagged animal, has been used.
Animal migration : a context for using new techniques and approaches / Keith A. Hobson and D. Ryan Norris -- An introduction to light stable isotopes for use in terrestrial animal migration studies / ...
It’s a crisp autumn morning, and the forest holds a quiet promise of motion overhead. Travelers arrive at a hidden nature preserve and pause, noticing faint shadows moving through the air and hearing ...
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