Animals communicate with one another in many interesting ways. These may consist of signs, gestures, looks, sounds, smells or even light produced by the body.
Song and dance are the other means of communication. When faced with danger, animals warn others using signals such as mock charges, grimaces or sound.
They also call their mates, inform other members of the group about the source of food, advertise territory and 'teach' the young the ways of the world. Baby birds call their parents for help and attention and demand food. Far from being a silent world, the ocean is a noisy place.
Fishes, molluscs, sea lions, walruses, whales and dolphins chatter away in the waters using a variety of sounds-whistles, squeaks, clicks and groans which range from low pitch to ultrasonic sounds beyond the range of human hearing. Whales and dolphins are sometimes called the 'musicians of the sea' as birds are of the sky.
According to the passage, the musicians of the sky are:
The musicians of the sky are birds, so the answer is birds.
The passage compares whales and dolphins to birds.
It calls whales and dolphins the musicians of the sea.
In the same comparison birds are the musicians of the sky.
So birds fill the role of musicians of the sky in the passage.
Walruses and dolphins belong to the sea, not the sky.
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