Trivia: The cuckoo bird was used at the beginning of the movie to point out what a parasitic bird does - secretly lays eggs in the nest of another bird species and leaves them for the different species to raise as their own. Another "brood parasite" that many people might be more familiar with is the Brown-headed cowbird. If all goes as intended, the different species, such as a Cardinal, will take care of the eggs until they hatch and continue feeding fledgings. Sometimes, "alien" eggs are evicted.
KeyZOid
15th Jun 2021