It makes sense to me that it would be "No me extraña" since you are saying it wouldn't shock you if the species went unknown. It could be "Vaya faena" depending on what you're trying to communicate, though it doesn't have the exclamation mark as you told. I can't say for sure if "Vaya faena" is accurate in that context because it's no a definition they use where I live (Puerto Rico) Make My Essay
Hope I helped :)

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