Milano Ice Skating Arena during the Milano Cortina 2026 Olympic Winter Games.

Milano Ice Skating Arena during the Milano Cortina 2026 Olympic Winter Games.

Galleria Vittorio Emanuele II during the Milano Cortina 2026 Olympic Winter Games.

Arco della Pace and lit brazier during the Milano Cortina 2026 Olympic Winter Games.

Spent a great few days in Milan taking in the sights and seeing some of the amazing figure skating #Olympics. Unforgettable! #MilanoCortina2026 #FigureSkating

Hester and myself with her PhD hat.

Happy and proud of the next fledgling of the Flack flock. Dr Hester Brønnvik @hbronnv.bsky.social defended her PhD thesis today. She has done a wonderful job. I could not be happier! @imprs-qbee.bsky.social @animaltracking.bsky.social @mpi-animalbehav.bsky.social

5/5 Migrating at the right time means migrating in bad weather. Older storks were performing worse at flight to perform better at migration. Whether or not an animal is improving its performance at a task can only be determined in the context of that task.

4/5 Soaring well requires good thermals. Waiting for the best thermals means waiting for summer afternoons. But if storks don’t migrate until the weather is good, they miss out on the breeding season.

3/5 We found that, rather than showing a learning curve, older white storks performed worse in almost all flight metrics. How do we justify this?

A white stork in flight. Copyright Christian Ziegler.

2/5 We tracked 151 storks over up to 8 migrations (at 1 Hz!) to ask whether they improve their soaring skills to migrate efficiently. We identified > 55,000 soaring & > 6,000 flapping events that allowed us to compare flight across ages & seasons.

If there is an optimal behavior, why is there so much variation in the world? We found that, for white storks, context is everything. @anflack.bsky.social @mpi-animalbehav.bsky.social

New paper! @cellpress.bsky.social doi: 10.1016/j.cub.2025.06.044
🧵1/5

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