Rio Tajo

Thanks Alice it is good to know that both girls are safe and in good areas.

Thanks Alice for update - just glad to know they are still doing well

Thanks, Alice ... good to know all is well with the girls. I've been out all day, and couldn't access any of the RSPB sites this morning before I left... I presume it was just my computer playing up :((

DjoanS

I don't think it was your computer - I've had trouble too but it seems OK now.  Alice - did you mean that Mallachie's data were from THIS-morning ie the 10th?  Anyway, good to know that they're both doing well - practising fishing no doubt!

birdnuts

Thanks for that ... I thought it was just me ... I downloaded new drivers and everything went wrong!!

Alan, The blogs seem to have been difficult to access today. But, I had an email of your post about Rothiemurchus and the potential danger he/she faces. I had to re-check Google for an approximate formula for radial distance of horizon, from observed altitude. Now this one is from Wikipedia and may need a health warning!

In SI units, the straight line of sight distance d in kilometres to the true horizon on earth is approximately

d = \sqrt{13h}

where h is the height above ground or sea level (in metres) of the eye of the observer. Examples:

   * For an observer standing on the ground with h = 1.70 m (average eye-level height), the horizon is at a distance of 4.7 km.

   * For an observer standing on a hill or tower of 100 m in height, the horizon is at a distance of 36 km.

So if Rothiemurchus was high enough the view would be considerable and land would be visible in clear conditions. The formula has lost the square root sign and is in text form; Distance in Km to the horizon equals the square root of the product of 13 times the height of the observer in metres. You can do you own sums, if you wish! Good lesson for any Maths students in the family. I bet there is a square root sign somewhere on this keyboard?

Rothiemurchus is a male, I beg his pardon!

JSB - I think you'll fine that Rothiemurchus is FEMALE!!

Thanks so much, Alice.  I love this bit of tracking their journeys.  We'll look forward to the next update.

Thanks Alice. Hope you have a good evening

Liz LFW : Sorry to disappoint but Rothiemurchus is a male. Quote from Roy dennis site "The oldest chick of a brood of three males at nest A18 on Rothiemurchus Estate, near Aviemore, Highland."

jsb : The math went straight over my head I am afraid but in laymans terms I see what you are getting at.

If Rothiemurchus can see land he will hopefully head in that direction. The problem is the wind direction and the strength of the wind. He may see land and try to reach it but be blown further out to sea.

Thanks Alice for the update - both taking it easy now it seems.  Rothes must be so laid back by now!  Am glad Mallachie has slowed up a bit and is scouting around.  Am pleased to say I have been to Monfrague National park - it's in the Extremadura area of Spain where I had a great wildlife trip with Speyside Wildlife.  Great for Eagle Owl Chicks and Spanish Imperial Eagle :o) and now a little osprey called Mallachie!!! :o) x

Thank you Alice great to hear they're both doing well.  Can't help wondering if Garten is behind or ahead of her sisters and where she has visited so far.  

Thank you Alice for updating us, good to know the girls are still safe.....enjoy your meeting tonight!!

Thanks Alice for the update always much appreciated.  Glad Rothes and Mallachie are fine and it would seem Mallachie is having a bit of a break.  Has found somewhere to fish and is taking it a bit easier.  Like others I am wondering about Garten and wonder where she is.  I am sure she also will have found somewhere where there are plenty of fish.

jsb maths nd me never did go together but I take heart that he might be able to see land if he is high enough.  Hope to hear he has made landfall in the very near future and doesn't go the way of dear Deshar.