Close up shot of a wild adult nicobar pigeon, caloenas nicobarica with a distinctive bill knob, roosting in dense vegetation, slowly falling asleep, a near threatened animal bird species

nicobar pigeon dove animal bird species caloenas nicobarica island andaman solomons palau india birdwatching wildlife plumage feather nature natural habitat dwelling roost singapore zoo park mandai reserve conservation paradise knob bill tree branch indian perch rest asian malaysia iridescent metallic forest nest southeast asia canopy tropical sleep asleep sit threaten