Prey of other animal classes is rarely taken by white-tailed eagles. Particularly, the diversity of reptiles known in the prey spectrum, at only 6 species, is quite paltry when compared to the many species known to be hunted by the bald eagle. Further among amphibians only two species of toad are known to be taken. The Ural mountains is the only region where some diversity of reptile and amphibian species have been reported in their diet. In only the white-tailed eagles nesting in Hokkaido, they've been known to hunt large cephalopods such as robust clubhook squid ("Onykia robusta") and giant Pacific octopus ("Enteroctopus dofleini"), though likely mainly younger specimens and those collected and perhaps injured by large-scale fishing operations. White-tailed eagle juveniles have been seen rarely foraging for unidentified clams and mussels on the Rhine. However, the miscellaneous shells of marine mussels and snails found in Norway are probably usually consumed secondarily from the stomachs of eiders. An exceptional number of insects, amounting to 24% of food items by number, were found in the foods of white-tailed eagles in Augustów Primeval Forest, Poland, almost entirely Odonata. The source of this food is not clear as the white-tailed eagle is far too large and bulky a raptor to invest much time in pursuit of insects.