[Ans] How long does it take a baby robin to reach adult size?

Step 1 : Introduction to the question "How long does it take a baby robin to reach adult size?"

...The fossil record indicates that birds evolved from feathered ancestors within the theropod group, which are traditionally placed within the saurischian dinosaurs. DNA-based evidence finds that birds diversified dramatically around the time of the Cretaceous–Palaeogene extinction event 66 million years ago, which killed off the pterosaurs and all the non-avian dinosaur lineages. Birds, especially those in the southern continents, survived this event and then migrated to other parts of the world while diversifying during periods of global cooling. Primitive bird-like dinosaurs that lie outside class Aves proper, in the broader group Avialae, have been found dating back to the mid-Jurassic period, around 170 million years ago. Many of these early "stem-birds", such as Archaeopteryx, were not yet capable of fully powered flight, and many retained primitive characteristics like toothy jaws in place of beaks, and long bony tails

Step 2 : Answer to the question "How long does it take a baby robin to reach adult size?"

Two weeks:

Baby robins grow fast, reaching the size of their adult parents in a mere two weeks. Both parents are responsible for feeding their newly hatched brood. The parents regurgitate food that's partly digested directly into each baby's mouth for the first four days. At 5 days old, they eat earthworms that their parents break apart. Each day, the babies eat more and more. Soon they'll graduate to eating whole earthworms. Source: Learner.org

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