Crows
Mostly american crows, but a few common ravens may have snuck in.
All images are links to higher quality versions. These can excede 20 MB.
Magpies
These are black-billed magpies (Pica hudsonia), which is closely related to the eurasian magpie... but unrelated to the austrialian species with a similar name.
Magpies will hide food to eat later, so this is fairly common behavior: it's minimizing the number of trips needed to take all of it. In any case, the caption still applies.
