| Predator name | Lutra lutra | Main Ref. | Brzeziński, M, J. Romanowski, L. Kopczyński and E. Kurowicka, 2006 |
| Predator group | Mustelidae | Predator stage | juv./adults |
| Predator I | mammals | Predator II | seals/sea lions |
| Prey stage | recruits/juv. | ||
| % of stomach contents | - very common (21-50%) | ||
| Locality | lowland rivers (Czarna Ha?cza and Biebrza) | ||
| Country | Poland | ||