My update review explains the Flynn effect IQ increase and its reversal as caused by the parallel increase of atmospheric mercury vapor over a century followed by the parallel reduction in recent decades. There is no reason why this causality should not apply equally to non-human animals, and so the theory makes a new prediction that the Flynn effect affects non-humans. This would be manifested in intelligently innovative behaviours and a certain amount of deviation from hitherto traditional innately-directed behaviours (a sort of "animal autism").
While I have not made any search for confirmation or disconfirmation, I have passively come to notice some support for this concept.
Firstly, a monkey inventing a new way of opening coconuts:
Secondly a species of monkey which was well-established to be vegetarian suddenly starting to eat eggs:
Plus you can hear this hilarious innovation in gibbon singing....