153710 Ring-necked Parakeet Psittacula krameri L 40-42cm. Colourful and distinctive alien with long-tailed outline in flight. Powerful bill is used to feed on nuts and fruits. Sexes are separable with care. Adult male has mainly green plumage with dark flight feathers. Note red bill and eyering, pinkish neck ring has dark lower border that links to black throat. Adult female is similar but lacks neck or throat markings. Voice Utters loud, squawking calls. Status Feral populations are established locally; leafy suburbs of W London are a stronghold.