 The chough lays three to five eggs 3 @.@ 9 by 2 @.@ 8 centimetres ( 1 @.@ 5 by 1 @.@ 1 inches ) in size and weighing 15 @.@ 7 grammes ( 0 @.@ 55 oz ) , of which 6 % is shell . They are spotted , not always densely , in various shades of brown and grey on a creamy or slightly tinted ground . 
