Final answer:
A robin closely matches the prototype of a bird with typical characteristics such as having a backbone, wings, and the ability to fly.
Step-by-step explanation:
A robin would very closely match the prototype of a bird because it possesses the key characteristics that are typically associated with birds. These characteristics include having a backbone, forelimbs modified as wings, and the ability to fly, which are traits generally expected in a bird prototype. Although there is an incredibly wide variety of bird species, with some exhibiting significant differences such as flightless birds or those possessing wings modified for swimming, the robin remains a quintessential example of a bird by most standards.