"Gee-Gee-Geezus its cold" the mystery bird chatters. I have an explanation of what could the Gee-Gee bird is.
There are multiple talking birds, but personally I'll consider the Gee-Gee bird a parrot. Parrots learn words from their owners, and the Gee-Gee probably learned that phrase from his/her previous owner. Maybe the owner went to Alaska with his bird, learned the phrase, escaped, and became a cryptid.
For a simple explanation of what it's trying to say, "Jesus, it's cold!"