Early-life stasis in partial seasonal migration is underpinned by among-cohort variation in migratory plasticity and selective disappearance. - Ugland CR; Acker P; Burthe SJ; Fortuna R; Gunn C; Harris MP; Hewitt JH; Morley TI; Newell MA; Swann RL; Taylor EA; Wanless S; et al. (The Journal of animal ecology, 2026)