Authors:

Don't panic, but we've got an audience." Clary turned her head. Perched on a nearby tree branch was Hugo, watching them beadily from bright black eyes. So the sound she'd heard had been wings rather than demented passion. That was disappointing.

Cassandra Clare (2010). “Cassandra Clare: The Mortal Instrument Series (3 books): City of Bones; City of Ashes; City of Glass”, p.277, Simon and Schuster
Don't panic, but we've got an audience. Clary turned her head. Perched on a nearby tree branch was Hugo, watching them beadily from bright black eyes. So the sound she'd heard had been wings rather than demented