The alveolar approximant is used especially at the end of a word.

The alveolar approximant is a type of consonantal sound used in some spoken languages.

This could explain why the alveolar approximant is one of the last sounds mastered by children, approximately at the age of four.

Speakers may articulate an alveolar trill instead of an alveolar approximant.

The alveolar approximant is a consonant.

The sound corresponding to the letter "R" is a retroflex or alveolar approximant rather than a trill or a tap.

Features of the alveolar approximant:

One phonological process typically found in child phonological acquisition is gliding - a segment substitution process involving the alveolar approximant.

Japanese speakers often mix alveolar lateral approximant sounds in other languages with alveolar approximant sounds due to a lack of alveolar lateral approximants in their own language.

A famous example is Winry Rockbell from Fullmetal Alchemist, who was variously spelled as Winry, Winly and Rinry by different groups due to the equivalence of the alveolar approximant and alveolar lateral approximant in Japanese.