| Male (1) | marine mammals (1) | MARK (1) |
| mass stranding (1) | maternal behaviour (1) | mating strategies (1) |
| mating system (1) | Meat (1) | Mediterranean Sea (1) |
| Meganyctiphanes norvegica (1) | Megaptera novaeangliae (2) | melon-headed whale (1) |
| mercury (1) | mercury concentration (1) | Mesoscale oceanographic processes (1) |
| methyl mercury (1) | methylmercury (1) | Microsatellite (1) |
| microsatellites (1) | migration (3) | migrations (1) |
| migratory movements (2) | mitochondrial DNA (1) | Molecular Sequence Data (3) |
| morphometrics (1) | Mortality (1) | mtDNA (1) |
| mtDNA variation (1) | muscle (2) | muscle biopsy (1) |