 When these Birds build their Nests , they choose a clean Place , gather together some Palm @-@ Leaves for that purpose , and heap them up a foot and a half high from the Ground , on which they sit . They never lay but one Egg , which is much bigger than that of a Goose . The Male and Female both cover it in their turns , and the young is not hatch 'd till at seven Weeks ' end : All the while they are sitting upon it , or are bringing up their young one , which is not able to provide itself in several Months , they will not suffer any other Bird of their Species to come within two hundred Yards round of the Place ; But what is very singular , is , the Males will never drive away the Females , only when he perceives one he makes a noise with his Wings to call to the Female , and she drives the unwelcome Stranger away , not leaving it till ' tis without her Bounds . The Female do 's the same as to the Males , whom she leaves to the Male , and he drives them away . We have observ 'd this several Times , and I affirm it to be true . 
