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It is clear from the passage that the research team was not surprised that the crows were trying to steal from each other common
Behavioural biologist Jane Atkinson and her colleagues have been
studying the subtleties of how crows steal food from one another.
Atkinson had been watching the birds at the beach as they fed on
fish, clams and other small animals in the intertidal zone. She
noticed that if a crow had found a particularly large meal that
couldn't be eaten in a single gulp, another crow would often come
by and try to steal the food away. Food theft is fairly common in the
bird world, so the crows' thievery wasn't unexpected. What really
intrigued Atkinson was that the birds employed two different tactics
to take the food. in some instances, the thieving bird would take an
aggressive approach - typically involving some chasing or physical
contact, such as pecking in other exchanges, however, the thief
would use a more passive method: merely approaching the other
bird secretively and steallng the food without any commotion at all.
What the team wanted to know was: how did these tactics fit into the
group foraging practices of the crows?