Perhaps evidence beneath the Gulf? 'If it looks like a duck, and quacks like a duck, we have at least to consider the possibility that we have a small aquatic bird of the family Anatidae on our hands,' said Rose, quoting Douglas Adams.
Speculative speculation I would've skipped over except for the Douglas Adams reference. If it walks like a duck and talks like a duck, then it must be time to listen to "Why a small aquatic bird of the family Anatidae? Why a no chicken?"