Bird vocalization (English Wikipedia)

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litencyc.com (Global: low place; English: 7,231st place)

mos.org (Global: low place; English: low place)

mtak.hu (Global: 6,485th place; English: 5,943rd place)

real.mtak.hu

nature.com (Global: 207th place; English: 347th place)

newsnationnow.com (Global: low place; English: 7,405th place)

nih.gov (Global: 5th place; English: 5th place)

pubmed.ncbi.nlm.nih.gov

ncbi.nlm.nih.gov

nj.com (Global: 610th place; English: 302nd place)

nytimes.com (Global: 7th place; English: 7th place)

orientalbirdclub.org (Global: low place; English: low place)

researchgate.net (Global: 96th place; English: 89th place)

science.org (Global: 1,007th place; English: 665th place)

sciencedirect.com (Global: 137th place; English: 146th place)

scientificamerican.com (Global: 1,110th place; English: 817th place)

blogs.scientificamerican.com

seeingwithsound.com (Global: low place; English: low place)

semanticscholar.org (Global: 15th place; English: 8th place)

api.semanticscholar.org

springer.com (Global: 182nd place; English: 172nd place)

link.springer.com

stanford.edu (Global: 194th place; English: 182nd place)

telegraph.co.uk (Global: 40th place; English: 27th place)

theguardian.com (Global: 16th place; English: 11th place)

thetedhughessociety.org (Global: low place; English: low place)

unm.edu (Global: 1,919th place; English: 1,213th place)

sora.unm.edu

uoregon.edu (Global: 3,189th place; English: 1,887th place)

interact.uoregon.edu

upworthy.com (Global: low place; English: low place)

uu.se (Global: 3,445th place; English: 3,148th place)

uzh.ch (Global: 1,380th place; English: 1,488th place)

zora.uzh.ch

vu.nl (Global: 8,771st place; English: 6,166th place)

research.vu.nl

washington.edu (Global: 1,171st place; English: 736th place)

faculty.washington.edu

courses.washington.edu

web.archive.org (Global: 1st place; English: 1st place)

wiley.com (Global: 150th place; English: 174th place)

onlinelibrary.wiley.com

worldcat.org (Global: 4th place; English: 4th place)

search.worldcat.org

adsabs.harvard.edu (Global: 14^th place; English: 9^th place)

archive.org (Global: 6^th place; English: 6^th place)

audubon.org (Global: 7,102^nd place; English: 4,317^th place)

bbc.co.uk (Global: 11^th place; English: 10^th place)

bbc.com (Global: 26^th place; English: 23^rd place)

biologists.org (Global: 5,151^st place; English: 4,741^st place)

bl.uk (Global: 1,181^st place; English: 639^th place)

bnf.fr (Global: 61^st place; English: 357^th place)

books.google.com (Global: 3^rd place; English: 3^rd place)

caltech.edu (Global: 240^th place; English: 473^rd place)

csiro.au (Global: 3,457^th place; English: 2,432^nd place)

doi.org (Global: 2^nd place; English: 2^nd place)

duke.edu (Global: 1,851^st place; English: 1,041^st place)

elsevier.com (Global: 365^th place; English: 372^nd place)

escholarship.org (Global: 1,477^th place; English: 863^rd place)

freepatentsonline.com (Global: 7,823^rd place; English: 5,787^th place)

ghostarchive.org (Global: 64^th place; English: 28^th place)

hdl.handle.net (Global: 66^th place; English: 34^th place)

jstor.org (Global: 23^rd place; English: 15^th place)

knowablemagazine.org (Global: low place; English: 9,041^st place)

litencyc.com (Global: low place; English: 7,231^st place)

mtak.hu (Global: 6,485^th place; English: 5,943^rd place)

nature.com (Global: 207^th place; English: 347^th place)

newsnationnow.com (Global: low place; English: 7,405^th place)

nih.gov (Global: 5^th place; English: 5^th place)

nj.com (Global: 610^th place; English: 302^nd place)

nytimes.com (Global: 7^th place; English: 7^th place)

researchgate.net (Global: 96^th place; English: 89^th place)

science.org (Global: 1,007^th place; English: 665^th place)

sciencedirect.com (Global: 137^th place; English: 146^th place)

scientificamerican.com (Global: 1,110^th place; English: 817^th place)

semanticscholar.org (Global: 15^th place; English: 8^th place)

springer.com (Global: 182^nd place; English: 172^nd place)

stanford.edu (Global: 194^th place; English: 182^nd place)

telegraph.co.uk (Global: 40^th place; English: 27^th place)

theguardian.com (Global: 16^th place; English: 11^th place)

unm.edu (Global: 1,919^th place; English: 1,213^th place)

uoregon.edu (Global: 3,189^th place; English: 1,887^th place)

uu.se (Global: 3,445^th place; English: 3,148^th place)

uzh.ch (Global: 1,380^th place; English: 1,488^th place)

vu.nl (Global: 8,771^st place; English: 6,166^th place)

washington.edu (Global: 1,171^st place; English: 736^th place)

web.archive.org (Global: 1^st place; English: 1^st place)

wiley.com (Global: 150^th place; English: 174^th place)

worldcat.org (Global: 4^th place; English: 4^th place)