Many people are under the impression that predation by Magpies is a major cause of population decreases in songbirds.
(Many people; are; under the impression that predation by Magpies is a major cause of population decreases in songbirds) (predation by Magpies; is; a major cause of population)
Many people predation by Magpies
are is
under the impression that predation by Magpies is a major cause of population decreases in songbirds
a major cause of population