Numbers 3:1-4:33

When 2 of Aaron's son's died, he only had 2 left to serve as priests.  That is when God appointed the Levites as the tribe to assist Aaron and be the priests, caretakers of the tabernacle.  The Levites were in place of all first born males in the Israelites.  Each clan within the Levites was assigned a particular section to care for so that all aspects of the Tent of Meeting were looked after.  Chapter 4 has very specific instructions about how they were to treat the Tent of Meeting and Tabernacle for travel. 

Are there still known descendants of the tribe of Levi?