Rodent species were introduced to many island systems accidentally as ships traveled around the world. Introduced rodents
are the likely culprits in at least 13 extinctions of native species.
Many rodents will opportunistically feed on bird and turtle eggs,
small birds, reptiles, and many other native species. What might
happen to the island system if a rodent species is introduced that
has no competitors for its preferred niche, no predators, and no
disease or parasites? Select all correct answers.
A. native species will compete with the rodents for limited
resources
B. the rodent population will fill different niches within the
island's ecosystems
C. the native species will outcompete the rodents
D. native species may go extinct