It's quite hard to tell when a sea creature is extinct – there's always hope it will turn up somewhere.
We see the surface of the sea: the rock pools, the waves, the horizon. But there is so much more going on underneath, hidden from view.
The sea’s surface conceals human impact as well. Today, I am writing a eulogy to the Derwent River Seastar (or starfish), that formerly inhabited the shores near the Tasman Bridge in Hobart, Tasmania. It is Australia’s first documented marine animal extinction and one of the few recorded anywhere in the world.
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