How many adult feathers do penguins need to survive?

Penguins do not have a specific number of adult feathers needed to survive, as their feather count can vary by species. However, adult penguins typically have around 70 to 100 feathers per square inch, which provides insulation and waterproofing. These feathers are crucial for maintaining body temperature and preventing hypothermia in cold environments. The overall health and condition of their feathers are more important than an exact feather count.