I haven't (yet) read the paper that they cite about this, but apparently though the journal it was published in is perhaps questionable, the authors themselves are respectable, having published other things in respectable journals. Perhaps the findings were outlandish enough that they had to resort to this one to get them out there. I'm getting this from Peter Watts' post about it [1].
Edit: I couldn't access the link to the ants paper from the article under discussion. Here's an alternate link to the paper that works for me: Are ants (hymenoptera, formicidae) capable of self recognition? Marie-Claire Cammaerts and Roger Cammaerts [2]
