the cleaner wrasse, Labroides dimidiatus, shows a high
level of learning flexibility in performing a reverse reward contingency
task, an ability previously demonstrated only in mammals
(Danisman et al. 2010).
Zebrafish, Danio rerio, also show a high
capacity for reversal learning, demonstrating an ability to rapidly
learn and relearn to attend to a reinforced stimuli after switching
the reinforced stimuli with a previously unreinforced stimuli
(Parker et al. 2012).