What differences do the American robin and the bee hummingbird have?

The American robin is a larger bird, typically measuring about 9-11 inches in length with a distinctive orange-red breast and a grayish-brown back. In contrast, the bee hummingbird, native to Cuba, is the smallest bird in the world, measuring around 2.2 inches long and weighing less than a penny. Additionally, while robins are known for their melodic songs and are often seen foraging on the ground, bee hummingbirds are renowned for their rapid wing beats and ability to hover while feeding on nectar from flowers. Their habitats and feeding behaviors also differ significantly, with robins thriving in varied environments and bee hummingbirds primarily found in tropical settings.