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At even greater depths, where their favorite meals of squids and lantern fish reside, the seals constantly moved their whiskers back and forth like a dish antenna scanning for a signal, the team reports today in the Proceedings of the National Academy of Sciences.

Around 250 different species of myctophids, or lantern fish, like the specimens above, make up much of this dense layer.

For sensing a dimly-lit environment, animals like this lantern fish may turn their eyes into giant lenses for low light.

He added that 90 percent of the Banks Peninsula fur seals’ diet consists of lantern fish, “which are not sought after in fishing.”

“Research shows 90 percent of Banks Peninsula fur seal diets is made up of lantern fish which are not sought after in fishing.”