I beg to differ ecchua, according to Indonesian research papers Palms tend to lay 2 eggs during rainy seasons and only 1 during dry season. This is a back up in case the usually open topped nest gets flooded. I mean, the hen lays one and another one later in case this happens.

Incubating done mostly by the hen with the male acting as feeder (much like hornbills) and is very protective. The breeding pen is off limit even to me but I did not notice any aggression when removing one chick.