Assertion: grey wagtail | /r/HasProperty | species
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Source sentences:
text: This excellent image from the BirdTrack flickr pool also provides a great opportunity to compare and contrast female Yellow Wagtail with Grey Wagtail, a species with which they can sometimes be confused.
text: Grey wagtails, a species which lives by rivers, has declined by almost a third (32%) since the survey started 20 years ago, while the familiar pied wagtail has seen declines of 11%.