Dictionaries, Thesauruses, Pictures, and Press Releases
- many-plumed moths
- map butterflies
- map unit
- Maraldi, Giacomo Filippo (Maraldi I)
- Maraldi, Giovanni Domenico (Maraldi II)
- Maranta
- Marantaceae
- Marasmius
- Marattiaceae
- marbled murrelet
- marbled newt
- marbled white butterflies
- Marcet, Jane Haldimand
- March flies
- Marchand, Richard Felix
- Marchant, Jean
- Marchantia
- Marchantiales
- Marchi, Vittorio
- Marchiafava, Ettore