Which of the following is a unique characteristic of birds, compared with other living vertebrates?

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Feathers are a unique characteristic of birds that distinguishes them from other living vertebrates. Scales on legs are found in reptiles, eggs that do not dry out are found in amphibians, parental care is not unique to birds and is seen in many other vertebrate groups. While some birds can fly, flight is not a universal characteristic of birds, as some flightless birds exist.

Which of the Following Is a Unique Characteristic of Birds