Assertion: booby's egg | /r/HasProperty | laid in system
Facets:
value: after courtship
type: TEMPORAL
value: usually
type: TEMPORAL
Source sentences:
text: After courtship which is less elaborate than the other Galapagos boobies, 2 eggs are usually laid 4 to 9 days apart in a system known as asynchronous hatching, though only one chick is ever reared.