You're a rookie detective working your first real case: a kidnapping. A boy vacationing with his parents, in fact. They said they were heading towards the next coaster, when they turned around and couldn't find him in the crowd. At first (they recounted tearfully), they thought he was just distracted by the aviary - his favorite - and went in to search for him.
By the time they realized he was missing, it was too late. The staff joined the search, but he was nowhere to be found. It's been almost 24 hours since they last saw him. He could be anywhere!
Fortunately for you, an anonymous tip just came in. Someone claimed to have seen a kid matching his description at their local fast food joint. Unfortunately, whoever he was with sped off before the police showed up. All they found was a note scrawled on the back of a receipt for a cheeseburger and fries that matches his handwriting.
The note reads:
cardinal x 2
Wha... did he think he was on a birdwatching trip?! You shake your head in disbelief.
As far as you know, the kidnappers are still on the loose and booking it. Your secretary has transportation officials on speed-dial, ready to set up a checkpoint on your command - they just need a location.
Where do you tell them to go?