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Oilbirds come out at night, live in caves in huge colonies, and echolocate, but they aren't bats! Why would this South American bird have evolved to be so similar to our favorite flying mammals of the night?

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Sources:
https://animaldiversity.org/accounts/...
https://abcbirds.org/bird/oilbird/
https://www.sciencefriday.com/segment...
https://animalevolution.whu.edu.cn/P...
https://www.iucnredlist.org/search?qu...
https://www.biodiversitylibrary.org/p...
http://www.bioscienceslabs.bham.ac.u...
https://www.frontiersin.org/articles/...
https://www.batcon.org/aboutbats/bat...
https://www.ncbi.nlm.nih.gov/pmc/arti...
https://animaldiversity.org/accounts/...
https://www.biodiversitylibrary.org/p...
https://repository.si.edu/bitstream/h...
https://journals.plos.org/plosone/art...
https://www.biodiversitylibrary.org/p...
https://avibase.bsceoc.org/species.j...
https://www.sciencedaily.com/releases...

Images:
https://3d.si.edu/object/3d/prefican...
https://datadryad.org/stash/dataset/d...
https://journals.plos.org/plosone/art...
https://www.gettyimages.com/detail/11...
https://www.gettyimages.com/detail/11...
https://www.gettyimages.com/detail/12...
https://www.gettyimages.com/detail/12...
https://www.gettyimages.com/detail/12...
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https://www.gettyimages.com/detail/12...
https://www.gettyimages.com/detail/12...
https://www.gettyimages.com/detail/12...
https://www.gettyimages.com/detail/12...
https://www.gettyimages.com/detail/13...
https://www.gettyimages.com/detail/13...
https://www.gettyimages.com/detail/13...
https://www.gettyimages.com/detail/13...
https://www.gettyimages.com/detail/13...
https://www.gettyimages.com/detail/13...
https://www.gettyimages.com/detail/14...
https://www.gettyimages.com/detail/14...
https://www.gettyimages.com/detail/14...
https://www.gettyimages.com/detail/14...
https://www.gettyimages.com/detail/14...
https://www.gettyimages.com/detail/14...
https://www.gettyimages.com/detail/14...
https://www.gettyimages.com/detail/14...
https://www.gettyimages.com/detail/14...
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https://www.gettyimages.com/detail/14...
https://www.gettyimages.com/detail/15...
https://www.gettyimages.com/detail/47...
https://www.gettyimages.com/detail/82...
https://www.gettyimages.com/detail/93...
https://www.gettyimages.com/detail/95...
https://www.gettyimages.com/detail/vi...
https://www.inaturalist.org/observati...
https://www.inaturalist.org/observati...
   • Urutau (Nyctibius griseus) Filmado en...  
   • Tracking and Counting Trinidad's Oilb...  
   • Oilbird Calls