Cassowaries are predominantly frugivorous, but omnivorous opportunistically when small prey is available. Agamas are mainly insectivorous, hunting prey by sight and snatching it opportunistically. Gulls are highly adaptable feeders that opportunistically take a wide range of prey. Larvae appear to also opportunistically feed on small zooplankton while swimming. The species appears to be hunted opportunistically during migration. Other rodents are taken largely opportunistically rather than by preference. Other ungulates are taken by Nile crocodile more or less opportunistically. "Acanthoplus discoidalis" is omnivorous and feeds opportunistically on many different foods. Of these predators, most only take fox squirrels opportunistically. They feed only rarely and opportunistically in their wintering waters. Evidence has accumulated opportunistically and direct observation is serendipitous. They eat mainly insects, but opportunistically consume fruit when plentiful. Scorpions and molluscs may be taken opportunistically as well. Utilized pieces are tools that began with one purpose in mind but were utilized opportunistically. American red squirrels are primarily granivores, but incorporate other food items into their diets opportunistically.