While this confirmed the iridescent beetles might be additional likely to endure hen predation, Kjernsmo and her colleagues thought the birds might however see the iridescent beetle cases, but avoid them on reason, perhaps simply because they think them to be venomous or in any other case unsuitable to consume.

So Kjernsmo and her colleagues done the identical experiment, but this time with human volunteers who — presumably — experienced no wish to consume the beetles.

“If it is explained that the birds were scared by the beetles, then human beings really should spot them easily,” she states.

But alas, “humans were surprisingly poor at spotting these iridescent products,” Kjernsmo states. They only spotted seventeen per cent of iridescent shells, compared to looking at eighty per cent of the solitary-coloured cases.

“It demonstrates that iridescence is a very great technique if you want to avoid getting spotted,” she states, adding that this variety of coloring probably operates as camouflage in other species as nicely.