Santa asked me to find the missing turtle doves. In exploring Elf U, I eventually make it to the Student Union, off the top of the quad. In there, I find all sorts of things, like the Swag Booth, booths from the sponsors like Google, Splunk, and of course SANS. Right by the fireplace, there are the doves:
I can talk to them and they say:
And it completes the challenge.