Ducklings are adorable: they waddle, and scatter, and follow their mother like their little lives depend on it. This last part is known as "imprinting." Newly hatched ducklings are always on their mother's webbed heels to become acquainted with world around them. A test at Oxford University shows that ducklings are such good imprinters that they can recognize differences in shapes and colors at the time they turn one year old! A must see for animal lovers.

Source: http://phys.org/news/2016-07-smarter-thought-scientists-newborn-ducklings.html