We last saw Glesni on Tuesday, August 19th at 07:54. Just as the 07:55 to Birmingham International was passing, she lifted off the larch perch, gained height and was gone.

Glesni's work at the Dyfi was complete. After all, she had her own international destination to get to.

Glesni is four years old and 2014 was her second year of breeding. Despite raising two healthy chicks again this year, it might well be what happened at the very start of the season that will remain long in the memory.

Monty has never been an early bird. He usually arrives back on the Dyfi during the first week in April, but considering that Glesni has no real track record to compare to, we had no idea what would be a 'normal' time for her to return. She arrived back on her nest on April 10th - to find things were just a little bit complicated.

Glesni arrived back at 06:40 only to find another female had been in residence since March 31st.

Glesni and her cousin from Rutland, Blue 24. The first and only peaceful encounter.

Blue 24 had occupied the nest with another male for a week - Dai Dot, until Monty returned on April 8th and quickly displaced him. Blue 24's allegiance to the nest was stronger, however, and to her new-found partner, Monty.

Glesni, weaker than normal after her long migration, looked as though she might have to relinquish her nest to her competing relative. She had two major attempts at regaining her nest and mate, but without success. Five days after returning, however, on April 15th, and after regaining some of her strength, she tried one more time.

What happened during April 15th will go down in osprey history as one of the most remarkable footages of osprey behaviour ever filmed. One female osprey displacing another - and it took a battle of epic proportions, both birds risking serious injury and death, until Glesni eventually came out the winner.

It made national news and was shown on Springwatch - here it is again:

Blue 24 never did go away completely, she's stayed around the Dyfi nest and was probably the main reason Glesni only laid two eggs and not three. Glesni's nemesis cousin is still around as I write - on one of the nearby electrical poles, and even landed on the nest beside Deri a couple of days after Glesni had gone.

Glesni was with us for 131 days this year and still managed to raise two beautiful and healthy chicks. Her determination to succeed and her resilience and fortitude were there for all of us to see.

Nest building, despite constant interruptions from Blue 24

Here are the key dates of the Dyfi nest so far:

Soon, Glesni's offspring will also be departing to start another chapter in their lives. Gwynant is 78 days old as I write, he may go at the end of this week. Deri, however, looks as though she may stay until the Dyfi is completely emptied of fish and is the size of a small elephant.

Monty, the lone parent once again, will no doubt stay until his and Glesni's two fledglings have started their migrations south.

Monty - missing a tail feather as well as his mate

2015 promises to be another interesting year. Will Glesni return a little earlier? What fate lies in store for Blue 24? Will we see Clarach or Cerist again on the Dyfi?

Family portrait.

Fly safe Glesni - see you next spring.