Fearsome yet fragile - GNS - Carcharius taurus #marineexplorer by John Turnbull
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Grey nurse sharks look pretty scary thanks to their prominent rows of teeth and thick-set bodies. Despite their appearance, they are considered to be generally harmless although should not be provoked. Indiscriminate killing in the 1960s resulted in the Australian east coast population becoming critically endangered. They have not recovered - the population is thought to be less than 1000 individuals. Their recovery is uncertain due to their long life span, time to maturity and low fecundity. Broughton Island
Slow evolutionary rate and two-step extinction led to ichthyosaurs’ demise
For more than 100 million years, a group of fish-like reptiles called ichthyosaurs dwelled the oceans of the Mesozoic. They were among the earliest reptiles to dominate the seas when they diversified in the early Triassic.

Despite their long reign, it took no meteorite impact or volcanic eruption to end this highly diverse group.

Image credit: Andrey Atuchin

#space #marine for #inktober 20/31

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Study proposes explanation for how cephalopods see color, despite black and white vision
For years, camera-makers have sought ways to avoid chromatic aberration—the color fringes that occur when various wavelengths of light focus at different distances behind a lens.

Cephalopods probably detect color by adjusting their eyes to detect different wavelengths of light, and then composite each into a “color” image of their world.


Drone Footage of a Feeding Whale.