Bird whose males incubate the eggs

EMU

This large, flightless Australian bird is the second-tallest in the world and lays dark green eggs that the father warms for nearly two months without eating.

This clue points to the emu, a large flightless bird native to Australia. Unlike most birds where females handle incubation, male emus take on the role—they sit on the eggs for about eight weeks without eating or drinking much. The answer is simply "EMU," with no wordplay or hidden meanings involved.