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Bobby Bach Leaves the Dyfi

Posted: Tuesday 29th August 2017 by Karis MWT

MWT - EithaMWT - Eitha

Eitha has started her long journey south

Three days have now passed since we last saw Eitha, the youngest of our three chicks from this year. Our cameras show her leaving the nest perch at 20:14 on Saturday night (26th). It is remarkable to think that she, along with all other juvenile ospreys, are flying south based purely on instinct, leaving behind the safety of the nest and all they have ever known.

Here’s a short video with the last pictures we recorded of Eitha, including her final flight from the nest perch.

Below is the completed migration chart, showing the ages of all Dyfi chicks at migration through the years. Both girls from this year were slightly older than average when they left for Africa, which may have been due to the weather we’ve had of late. Strong southerly winds and rain arrived shortly after Aeron left us; not exactly ideal for osprey migration.

Age at migration of all chicks raised by Monty and Nora (2011-12) and Glesni (2013-17)
MWT - Migration graph

The following graph shows the number of days between each chick fledging and migrating, and there are some very interesting patterns.

It suggests that the eldest chicks are always quickest to leave in broods of three (2011, 2015 and 2017), with middle chicks always taking the longest. In years where only two chicks are raised (2013 and 2014), the youngest chick has always been the quickest to migrate, though not by any substantial margin as yet.

Days between fledging and migration, accurate to the nearest minute! 
MWT - Fledge_Migration graph

Our sample size is still fairly small at present, however, and there are countless numbers of variables that could be influencing the results above. As more data is collected in coming years (and lovely statistical analyses are performed) we may find that no significance to the patterns described, but we won’t know unless we try!

Sibling traits? We can only hope

Eitha captured the hearts of the nation when she hatched back in May, causing widespread concern as she was so much smaller than her siblings and often the last in line to be fed. At the time of ringing, Eitha was only 32 days old, making her one of the youngest chicks at ringing. Despite this, she joined fellow females, Menai and Clarach, in being the heaviest birds we have ever ringed on the Dyfi; weighing in at a very healthy 1710g.

Eitha photographed two months ago at ringing, 32 days old
MWT - Eitha at ringing
 

Let’s hope that Menai and Eitha also share their sister Clarach’s success, should they return to breed in 2-3 years’ time.

Clarach and her unringed partner have managed to raise two healthy boys on her first attempt at breeding up in Aberfoyle, Scotland. Both chicks are still being seen around what remains of the nest, with storms causing significant damage to the structure in the middle of last week. Luckily no birds were harmed and all four ospreys in the family were seen, seemingly unscathed, over the following days.

Keep up to date with Clarach and her family here.

LH0 and LH1 perching on what is left of their nest, thankfully looking none-the-worse after the storm!
MWT - Clarach chicks 2017
 

Got the place to himself

With the rest of his family gone, Monty will now be building up for his own migration. It's not known exactly what prompts the males to leave, and even when comparing his departure dates to those of the chicks in previous years, we are still unable to predict when he will leave with any real accuracy.

In the past two years, Monty has waited around the nest for little over a week following the disappearance of his last chick. If we see a repeat of this then we may well have another four days with him before he heads off, yet again, on his journey south. 

The Dyfi Osprey Project closes its doors for the last time this Sunday, 3rd September having opened for 155 days straight and engaged with almost 40,000 visitors. Live streaming and chat will both be turned off for the year the following day, Monday 4th September, as we call time on another fantastic season for the Dyfi ospreys.

Monty up on the larch perch this morning, will he still be here tomorrow?
MWT - Monty on larch

Read Karis MWT's latest blog entries.

Comments

    another season finishing,doesn't seem possible.thank you to all the volunteers and staff there this year we had some great visits(good to see the 'wednesday boys' too!) Happy Christmas xxMary and Buster

    Wednesday 30th August 2017
    by maryb

    Thank you Karis for this beautifully compiled blog - so appreciative for all of your invaluable info and beautiful videos; tremendous thanks also to Emyr and the 'A' Team!!  It has been a truly memorable, wonderful season which has literally just flown past!!  These babies, along with others migrating south now take a piece of our hearts with them and with a 'wing and a prayer,' we trust and hope for a safe passage and return in 2-3 yrs time to hopefully and successfully raise their very own.  Cannot come too soon to see Glesni and Monty back again, what superb parents they are - a huge thank you and wishing you all a lovely break from all of your hard earned efforts, work and skills. - Oh yes, 'Chat' has been absolutely wonderful, everyone has been so helpful and kind to me a 2nd year novice! Denise Jones  

    Wednesday 30th August 2017
    by DJ

    Thanks Karis for the farewell blog and vid of our lovely Eitha. I try not to have favourites over the osprey seasons, but Deri and her much younger sister Eitha have come on top for me. Deri was the loudest, Eitha the most determined. Both beautiful birds! Hope to see them again.   

    Tuesday 29th August 2017
    by sue g

    Diolch A2

    Tuesday 29th August 2017
    by Emyr MWT

    Rydych wedi gweld y negeseuon o werthfawrogiad gan bawb sydd yn dilyn Gweilch y Dyfi. Maent yn dodi ar bapur teim;adau eich llu o gefnogwyr.   Tan y tymor nesaf!

    Tuesday 29th August 2017
    by A20

    Thank you all at Dyfi, either it's the shortest season I can remember or I am older than I feel!

    Tuesday 29th August 2017
    by VJP

    Another interesting and informative blog - thanks very much Karis.  I feel guilty having a favourite but I did have a very soft spot for Eitha this year and her fledging was awesome!  Hope she has a safe migration and fingers crossed that we see Eitha again in 2-3 years' time.  I'm so pleased to hear we've maybe got a few more days with the fabulous dad, Monty! :-) x

    Tuesday 29th August 2017
    by Daffodil

    Thank you Karis for yet another fine Blog. I'm sure many will be delighted to see the link to Aberfoyle as am I. Just an extension of the legacy that is DOP. Long may it continue. My thanks and best wishes to all involved.  

    Tuesday 29th August 2017
    by Mike Simmonds

    Thank you so much - dioch yn fawr iawn - to everyone at the project for giving us all such a wonderful year of information, viewing and updates. It's been a brilliant season. Let's hope we see them all back sometime after their African holiday.

    Tuesday 29th August 2017
    by marganded

another season finishing,doesn't seem possible.thank you to all the volunteers and staff there this year we had some great visits(good to see the 'wednesday boys' too!) Happy Christmas xxMary and Buster

Wednesday 30th August 2017
by maryb

Thank you Karis for this beautifully compiled blog - so appreciative for all of your invaluable info and beautiful videos; tremendous thanks also to Emyr and the 'A' Team!!  It has been a truly memorable, wonderful season which has literally just flown past!!  These babies, along with others migrating south now take a piece of our hearts with them and with a 'wing and a prayer,' we trust and hope for a safe passage and return in 2-3 yrs time to hopefully and successfully raise their very own.  Cannot come too soon to see Glesni and Monty back again, what superb parents they are - a huge thank you and wishing you all a lovely break from all of your hard earned efforts, work and skills. - Oh yes, 'Chat' has been absolutely wonderful, everyone has been so helpful and kind to me a 2nd year novice! Denise Jones  

Wednesday 30th August 2017
by DJ

Thanks Karis for the farewell blog and vid of our lovely Eitha. I try not to have favourites over the osprey seasons, but Deri and her much younger sister Eitha have come on top for me. Deri was the loudest, Eitha the most determined. Both beautiful birds! Hope to see them again.   

Tuesday 29th August 2017
by sue g

Diolch A2

Tuesday 29th August 2017
by Emyr MWT

Rydych wedi gweld y negeseuon o werthfawrogiad gan bawb sydd yn dilyn Gweilch y Dyfi. Maent yn dodi ar bapur teim;adau eich llu o gefnogwyr.   Tan y tymor nesaf!

Tuesday 29th August 2017
by A20

Thank you all at Dyfi, either it's the shortest season I can remember or I am older than I feel!

Tuesday 29th August 2017
by VJP

Another interesting and informative blog - thanks very much Karis.  I feel guilty having a favourite but I did have a very soft spot for Eitha this year and her fledging was awesome!  Hope she has a safe migration and fingers crossed that we see Eitha again in 2-3 years' time.  I'm so pleased to hear we've maybe got a few more days with the fabulous dad, Monty! :-) x

Tuesday 29th August 2017
by Daffodil

Thank you Karis for yet another fine Blog. I'm sure many will be delighted to see the link to Aberfoyle as am I. Just an extension of the legacy that is DOP. Long may it continue. My thanks and best wishes to all involved.  

Tuesday 29th August 2017
by Mike Simmonds

Thank you so much - dioch yn fawr iawn - to everyone at the project for giving us all such a wonderful year of information, viewing and updates. It's been a brilliant season. Let's hope we see them all back sometime after their African holiday.

Tuesday 29th August 2017
by marganded