Why are kiwis birds classified as at risk?
The main reason why kiwi are at risk is that they are under considerable threat from dogs, feral cats and other imported pets including the stoat. New Zealand has no native predators. Being a small, flightless bird, the kiwi's defenses are extremely limited. Many kiwis are also killed every year by unregistered Pig-Hunting dogs (registration requires Kiwi Aversion training) and being killed while crossing roads/highways.
Loss of habitat due to deforestation and destruction of large tracts of native bush is also endangering the kiwi. Not only does this threaten its food sources, but deforestation means the kiwi has fewer places to hide from its many predators. Prior to Europeans coming to New Zealand, the kiwi enjoyed a healthy population.