These are a milky-blue colour, usually plain but sometimes with a slight speckling of rusty-brown and measure an average of 21.7 by 16.2 millimetres (0.85 in × 0.64 in). The hen incubates the eggs which hatch in about thirteen days. The young are fed by both parents and fledge when about eleven days old, but are not fully independent for another twelve days or so.[1]