Definition of demon bird in English:

demon bird

noun

  • Any of various birds associated in folklore with misfortune or death, or regarded as demonic in nature or aspect; especially (in Sri Lanka) a forest bird which at night gives a call resembling a wail or scream, variously identified as a nightjar, honey buzzard, hawk eagle, or owl.

Origin

Early 19th century; earliest use found in John Davy (1790–1868), physiologist and anatomist.