Carnivore
- Opportunistic predator (from Riley and Huchzermeyer 2000)
- Diet varied (Pauwels et al. 2007)
- Includes a variety of invertebrates and small vertebrates
- Consume aquatic and terrestrial items (Pauwels et al. 2007; Riley and Huchzermeyer 2000; Waitkuwait 1989)
- Invertebrates are the primary food source, most studies (Eaton 2010a)
- Millipedes and beetle larvae commonly consumed in southwestern Gabon (Pauwels et al. 2007)
- Reptiles, amphibians, and small mammals also taken (Pauwels et al. 2007; Riley and Huchzermeyer 2000; Waitkuwait)
- Fish commonly consumed (Eaton 2010a)
- Plant debris often found in stomach contents (Riley and Huchzermeyer 2000)
- Rocks (from Pauwels et al. 2007)
- Gastroliths found in stomach content samples
- Function
- Not likely to aid in buoyancy
- Mass suggests an alternative function
- Possibly assist with food processing
- May aid against parasites
Animal prey (from Luiselli et al. 1999; Pauwels et al. 2007; Riley and Huchzermeyer 2000; Waitkuwait 1989)
- Fish
- Other vertebrates
- Terrestrial amphibians and reptiles
- Small mammals
- Birds
- Snails
- Annelid worms
- Arthropods
- Millipedes
- Spiders and scorpions
- Crabs and shrimp
- Beetles
- Cockroaches
- Katydids
- Grasshoppers
- Moths and caterpillars
- Aquatic insect larvae and tadpoles eaten by hatchlings