Could you find some videos for those cases? Would be interesting to see this in action.
But here is a paper showing penguins photographed with a temperature-sensing IR camera, showing the majority of the surface of their body being around -21ºC thanks to the highly insulating plumage.
https://x.com/The_Astral_/status/2052922220486205496
Please tell me your feelings on the big picture. I feel it's imbalanced if you provide such certainty to some examples but refrain from a larger perspective. It's okay if you don't want to tho, I just want to know where you're coming from I guess.