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Earliest animal with a head was also the oldest known ‘righty’
A 550‑million‑year‑old sea worm may be the earliest animal with a head and the first known right‑handed creature.
Ediacaran
2 trends tracked about this subject — the full history, oldest to newest below.
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Science
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These Animals Were Righties Long Before Hands Even Evolved
New fossil analysis identifies behavioral handedness in the 550-million-year-old organism Spriggina floundersi, marking the earliest evidence of the trait.