They could do this by responding effectively to female signalling, which is already known to occur in bowerbirds.

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And, in fact, CD is well known to occur simultaneously with other disorders, like ADHD, mood disorders, post-traumatic stress disorder, and anxiety.

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This type of impact by top-of-the-food-chain predators on lower trophic levels is well known in marine systems, said Peterson, and has been shown to occur in terrestrial systems in the study of invertebrates.

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He feared he might suffer from Stendhal's Syndrome - a psychological reaction that can occur when a person is exposed to a very well known, very beautiful painting - which can lead to palpitations and dizziness.

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