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"The emerald turaco and the hoopoe, both with crown-like head feathers, scored highly," they wrote in their paper in the psychology journal i-Perception.

Amid a dawn chorus of crickets, mosquitoes and the “jee-ow!” of the great blue turaco, the forest canopy began to shake as a screech rang out.

The turacos are stretching their necks and heads a particular way to build muscles that they’d need to thrive in the wild.

"Not unlike adjusting the focus on a distant turaco through binoculars."

We were seeing great stuff in Ghana, spectacular turacos and bee-eaters found only in west Africa.