when penguins huddle, it creates air pockets between them. air is a good insulator and so it will trap the body heat of the penguins. it also makes the whole group of penguins warmer and the product...
the size doesn't matter. there thick coat of feathers and blubber keeps them warm
They have warm feathers, and warm layers of subcutaneous fat.
By putting a coat on and wrapping up in blankets :):):):):):)
They use air conditioning and blankets.