All three of the Ospreys that hatched in the 2024 season in a Powys reserve have now migrated south for the winter.

On Friday, August 30, young Osprey Gwenlais migrated from the Dyfi Osprey Project after 101 days at the nest in Powys, the last of three birds who hatched earlier this year.

This made her the third oldest offspring to migrate from the Dyfi Osprey project. Her two siblings, Senni and Coron, left a few weeks earlier. Despite being the youngest of the three birds, was the first to leave, taking flight at just 84 days old. Coron left after 92 days.

The three birds are the offspring of Telyn and Idris, the longest mating pair of birds in the history of the Dyfi Osprey Project, hatching their fifth clutch of eggs in Powys in June.

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While Telyn began her migration journey on August 22, Idris stayed at the nest until the last of the offspring had flown away.

Analysing the patterns of when their birds migrate, Dyfed Osprey Project said via social media: “We're pretty sure they have all migrated, but Idris is still here, currently eating a flounder on Monty's perch. It must be a strange feeling for him to be home-alone after the last five months of family duties.

“As opposed to earlier season metrics that are governed more by biology (egg laying, hatching), the decision to migrate is much more of an individual choice.

So long as the bird is developed enough to fly, individual decisions play a more prominent role in migration age than any other metric.

“There is huge variability in migration ages, ranging from just 77 days (Pedran 2022) and his sister at 109 days (Padarn 2022) the following year. That's an extra 32 days to make the same decision, over a month difference.

“Given enough data and years, it would be interesting to compare these different migration ages against the birds that return and breed as adults. Does staying longer at the natal nest give young ospreys an advantage, or is the opposite true?”

With the resident birds now bound for Norh Africa, the Dyfi Osprey Project is due to close for the season on Sunday, September 8, with the live stream of the nest ending at 8pm.

They added: “Thank you for all your donations and kind support over the season. Look out for our 2024 season summary blog on Sunday.”