Indeed. (Raising eyebrow in a Spock like manner)
How about large flying creatures as big as airplanes soaring through the blue skies. They don’t breathe oxygen, but get their energy from their Sun like our plants do. Their wings are like huge solar panels. They can handle a wide range of temperature and pressures and they live for thousands of years.
They did not evolve on the Gas Giant planet, but on one of its Earth-size moons. Some moved their and have build huge floating cities.
Okay, my imagination is getting out of hand. Back to the Earth.