1. Guided by whim and fancy
   - flighty, flyaway, scatterbrained

See also: frivolous

• genus Musa
• genus Musca
• genus Muscardinus
• genus Muscari
• genus Muscicapa
• genus Muscivora
• genus Musophaga
• genus Mustela
• genus Mustelus
• genus Mutinus
• genus Mutisia
• genus Mya
• genus Myadestes
• genus Mycobacterium
• genus Mycoplasma
• genus Mycteria
• genus Mycteroperca
• genus Mylodon
• genus Myocastor
• genus Myopus
• genus Myosotis
• genus Myotis
• genus Myrciaria
• genus Myrica
• genus Myricaria