Talk:Sky Beak and Ocean Flow/@comment-37139479-20181108203514/@comment-35446663-20181129010501

All evidence from canon dialogue would indicate they were both seaponies at the time. The Storm King was defeated about a year prior to the episode, and Twilight was interested in Terramar and Silverstream's baby pictures because of her curiosity for "early seapony development". That would place them being born while both parents were seaponies.