Note: Since coconut shells grow naturally, the size of each coconut nest may vary slightly. unpolished Hamsters, golden hamsters, squirrels and other small rodents. finches, canaries, songbirds, hummingbirds, parrots and other birds. Made of pure natural coconut shell, no oil, no glue, no paint, no peculiar smell, especially safe for pets. Coconut shells are very hard and durable. This tropical island-style aviary will add an exotic touch to your parakeet cage. Since it is a natural product, it also blends well into your garden, unlike plastic birdhouse designs.