Question
How were the bird-voiced treefrogs counted?
Short answer
Interns set fifty passive pipe traps on trees at each of ten swamp sites, five hundred traps in all, and checked them weekly for four weeks. Each frog got a uniquely numbered transponder tag.
Source: NGRREC Research Interns Hear the Call of the Swamps
Where this answer comes from
Jessica Mohlman
The wildlife ecologist who led the bird-voiced treefrog research behind The Call of the Swamp. She co-wrote the 2021 field report in Outdoor Illinois Journal with John Crawford.
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