Natural Foods:
* Fruits and Seeds: They'll readily eat fruits, berries, nuts, seeds, and grains.
* Insects and Small Animals: Rats are omnivores, so they will eat insects, worms, snails, and even small birds or reptiles if they can catch them.
* Roots and Tubers: They might dig for roots and tubers, especially in tropical environments.
* Carrion: They will scavenge for dead animals, acting as natural scavengers.
Human-Related Food:
* Garbage: Rats are drawn to human settlements and will often raid trash cans and dumps for food scraps.
* Pet Food: If accessible, they'll eat pet food left outdoors.
* Crops: They can cause significant damage to agricultural crops like grains, vegetables, and fruits.
Important Note:
* Invasive Species: Rats are often introduced to islands by humans, and they can become invasive species. This can lead to problems like the destruction of native plant and animal life, and the spread of diseases.
Let me know if you'd like more details about a specific island environment!