Herring gulls are smart, they know if you are looking at them (and usually avoid stealing your food when you do) ^^ Herring gulls respond to human gaze direction | Biology Letters share.google/Sdg1k9aoyRVzoiiSi

De-googled link:

doi.org/10.1098/rsbl.2019.0405

Which leads to royalsocietypublishing.org