The claim presented is that the bees recognized the absence of marks without prior training. Unfortunately the article doesn't really go into how the experiment was set up, or whether it was repeatable, or what theories of variation were tested. So it's more of a conversational factoid. I hate science news that has the intellectual depth of Cosmo sex surveys...
“I hate science news that has the intellectual depth of Cosmo sex surveys...”
And so many of them contain, like this one, a certain amount of anti-human bias, like the little dig on preschool humans.
The anti-human bias is of course especially prevalent in any global warming “study”.