The bizarre mating dance of the hooded grebe

Why Evolution Is True

Reader Charleen sent me the tweet below, which shows the courtship ritual of the hooded grebe (Podiceps gallardoi), a rare and critically endangered species (fewer than 1000 individuals) that lives in isolated Patagonian lakes. Have a look at this craziness, and ask yourself “Why the hell are they doing this?” or “What selective advantage is there in testing each other this way?” And don’t ask me, because I have no idea! It’s clearly a bonding ritual, but may be a form of mutual sexual selection in which potential mates size each other up in some way:

A photo:

That in turn led me to a new article in Audubon magazine that identifies the clip as coming from a new movie about the species, “Tango in the…

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