This bird!
It could fit anything it wanted in its mouth.
Did you know that there's a species that lays its eggs on a mountain, and then a bird much like this one migrates over a few months later and grabs many of the eggs to eat as it flies down the mountain?
About half of the eggs are eaten but the others have enough time to hatch and jump out of the neck pouch, tossing themselves into the safety of isolated lakes! What an interesting cycle isn't it? I wonder if these birds of yours also carry babies inside of their neck pouches to eat.
What is up with this game and consuming babies as snacks? Geez!