The Blue Bird Micro Bird is an American school bus introduced in 1975 by the Blue Bird Corporation. It is a small Type A (cutaway van), with passenger capacity ranging from 10 to 30 passengers. The Micro Bird was originally designed as a school bus, but it is also sold as a MFSAB (Multi-Function School Activity Buses). MFSABs are alternatives to 15-passenger vans that along with school systems that have come into use by child care centers and other organizations due to changing safety regulations.