It's often described as a labiodental /r/, but my phonetic research here in Cambridge suggests it has some velarisation (like 'w'). Hypolingual /r/ is a term which has been used in some phonetic ...

In English, /p,b,m/ are bilabial sounds. Labiodental: Labiodental sounds involve the lower lip (labial) and upper teeth (dental) coming into contact with each other to form an effective constriction ...

What we lose when languages die.

Pollard-Durodola, Sharolyn D. and Simmons, Deborah C. 2009. The Role of Explicit Instruction and Instructional Design in Promoting Phonemic Awareness Development and Transfer From Spanish to English.