Street Urchins

Sometimes dinner turns into a mob and bites back.

Well at least that’s what it looks like…

In a shocking turn of events a common sun star (starfish species) was gobbled up by a group of sea urchins (their natural prey species) at a research station in Sweden. Which is just a little bit out of character for the vegetarian lawnmowers that are sea urchins – although make no mistake they can vacuum up a kelp forest if given half the chance.

Although the ‘why’ as to what drove the sea urchins to turn on the starfish (a case of hunger perhaps, or an attempt to remove the threat of predation) remains unclear, the interesting thing is that although the sea urchins have a comparatively simple nervous system (they don’t even have a true brain), they are still able to execute an organised form of attack. This attack strategy has been termed ‘urchin pinning’ by the research team and is usually instigated by one individual that starts the ‘attack’ and is then joined by the other sea urchins who begin munching away at the starfish. They start at the tips and moving inwards, leaving the starfish unable to get away…

The original research article can be found here: https://doi.org/10.1111/eth.13147

A note for sensitive readers: Although many starfish were harmed in the making of this comic they are expected to make a full recovery (physically at least).

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