Jellyfishes
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The by-the-wind sailor (scientific name: Velella velella) is a floating colony of tiny polyps. It is made of an ovoidal disc filled with ait (so it can float) bearing a triangular sail (so it can drift with the wind). As the sail is set diagonally on the float, left sailing and right sailing forms are sorted out and blown to opposite directions. Underneath the float several short tentacles hang down into the water to capture prey such as planktonic animals and small or juvenile fish. Read more |
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The good news is that not all jellyfishes produce painful stinging, and most of those who do live in tropical waters (especially in the South Pacific Ocean and around Australia). Unfortunately, among the latter, some may be really dangerous and may even lead to death because of the venemon itself, of allergic reactions or because the patient is in the water and may be unable to keep swimming.Read more |
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