“The butterflies…what an educated sense of beauty they have. They seem only an ornament to society, and yet, if they were gone, how substantial would be their loss.” — Phil Robinson
Penguins are highly social and communicative creatures. Each penguin has a distinct call that identifies their mate or baby. It's like you or me calling out "Hey Ralph!". In other words, they communicate well within their social structure. They prefer to be in groups. This is partly for social connection, partly for survival, and partly for warmth. They huddle in groups to stay warm. In fact, they rotate their group formation, allowing the outer penguins inside the inner circle. That way, everybody gets a chance to be in the middle of the warm "group hug!". - Avia Humboldt penguin (Spheniscus humboldti)
The cheetah is the fastest animal on land and unlike other big cats, cheetahs cannot roar.
However, they are the largest cat that can purr on both inhale and exhale, like domestic cats.