 The royal tern is similar in size to this species , but has a heavier build , broader wings , a paler back and a blunter , more orange bill . The greater crested often associates with the lesser crested tern , but is 25 % larger than the latter , with a proportionately longer bill , longer and heavier head , and bulkier body . Lesser crested tern has an orange @-@ tinted bill , and in immature plumage it is much less variegated than greater crested . 
