South African cliff swallow (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "South African cliff swallow" in English language version.

refsWebsite

Global rank English rank

1iucnredlist.org

88^th place

160^th place

2^nd place

2^nd place

1biodiversityexplorer.org

low place

low place

1interestingengineering.com

8,846^th place

5,943^rd place

biodiversityexplorer.org

"Hirundo spilodera (South African cliff-swallow)". Biodiversity Explorer. Retrieved 5 February 2010.

doi.org

BirdLife International (2017). "Petrochelidon spilodera". IUCN Red List of Threatened Species. 2017: e.T22712412A118750418. doi:10.2305/IUCN.UK.2017-3.RLTS.T22712412A118750418.en. Retrieved 16 November 2021.

interestingengineering.com

"Unladen Swallows". Interesting Engineering. 18 March 2020. Retrieved 9 May 2021.

iucnredlist.org

BirdLife International (2017). "Petrochelidon spilodera". IUCN Red List of Threatened Species. 2017: e.T22712412A118750418. doi:10.2305/IUCN.UK.2017-3.RLTS.T22712412A118750418.en. Retrieved 16 November 2021.