Meaning: This sentence describes the birds' ability to fly and their location in the sky, above the clouds.
Choice of Words: "Birds" refers to flying creatures with feathers and wings. "Fly" means to move through the air using wings. "High" describes being at a great distance from the ground. "Above" means being higher than something. "Clouds" are white or gray masses of tiny water droplets or ice crystals in the sky. The sentence creates a vivid image of birds soaring through the sky above the clouds.