It's noteworthy to me that every scientific discovery is that non-human animals are "more clever than we thought" - and never ever the other way around.
I've seen a couple "Koalas are even dumber than we thought" articles
Poor lads really are exceptionally dumb
Koalas are the one that springs to mind. I believe the test result was "does not recognize their only food source (eucalyptus leaves) when served plated."
It would be uninteresting. Think of almost any headline where some species is described as "dumber than previously thought". Not especially interesting.
"We gave an animal some tools and a mirror and it ignored the tools and couldn't recognize itself" happens too often to be a headline.