They are a long-lived species and a pair will not lay eggs every year.
Under a table lay a pair of disreputable looking sneakers.
In all species, each pair lays a single egg per breeding season.
Near the fire lay a pair of dice and some money.
A breeding pair will lay a single egg each year.
A pair of driving gloves lay on the seat beside Ray.
The pair then lay down and went to sleep!
It had its first success in 2008, when a pair laid two eggs.
Most pairs lay 3 eggs, but the mean number hatched is less than 2.
A pair of used sheets lay crinkled on the floor.