Image: Hyla cinerea - distended vocal sac
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Description: American green tree frog (Hyla cinerea), with distended vocal sac
Title: Hyla cinerea - distended vocal sac
Credit: Green Treefrog (Hyla cinerea) (4)
Author: Clinton & Charles Robertson from Del Rio, Texas & College Station, TX, USA
Usage Terms: Creative Commons Attribution 2.0
License: CC BY 2.0
License Link: https://creativecommons.org/licenses/by/2.0
Attribution Required?: Yes
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