Assertion: black headed gull | /r/HasProperty | larus ridibundus
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Source sentences:
text: …“hooded” gulls, exemplified by the black-headed gull (Larus ridibundus) and laughing gull (L. atricilla), have a striking “swoop-and-soar” aggressive flight display, and a ground display (called the “forward”)
text: …study of eggshell removal by black-headed gulls (Larus ridibundus).