What is the most distinguishing physical feature of a juvenile American Robin's plumage?

Answer

Heavy spotting or speckling across their chests and breasts.

Juvenile robins are predominantly brown and are most distinguished by heavy spotting or speckling across their chests and breasts for camouflage.

What is the most distinguishing physical feature of a juvenile American Robin's plumage?
birdanimalphysical featureRobin