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Liña 134:
* [http://markus.nolf.org/blog.php?p=160 Time-lapse video showing the egg's development until hatching]
* [http://www.midwestfrogs.com Frog calls]{{Ligazón morta|data=agosto de 2018 }}
* [https://web.archive.org/web/20070927212723/http://www.naturenorth.com/spring/sound/shfr2snd.html Frog calls - Canada]
* [http://www.naturesound.com/frogs/frogs.html eastern United States Frog calls - eastern United States]
* [http://www.bbc.co.uk/nature/animals/wildbritain/springwatch/ Record UK Frogspawn sightings here]
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