BBC News - Honeybees 'cleverer in the morning':
"...earlier research had already established that bees' behaviour is very dependent upon the time of day. As far back as 1960, one researcher actually flew a group of bees from Paris to New York and found that the 'jet-lagged' bees maintained their Paris-timed daily cycle of activity.
But this, the researchers say, is the first study to show that bees are better able to learn in the morning.
In their journal article, the team wrote that this effect was probably a result of bees and the flowers they pollinate 'co-evolving"
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