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-------------------------- Snow, 2012
Snow fledged safely Snow fledged - 43 days old Snow, Cilla Snow being weighed, measured Snow - Day 38 Snow - Day 24 Snow on the alert Beau and egg (pre-Snow) A regal Beau in residence Snow - Day 3
-------------------------- Narrambla, 2011
Narrambla still there 2 Narrambla still there Narrambla released 3 Narrambla released 2 Narrambla released Narrambla in care 2 Narrambla in care Narrambla 3 Narrambla 2 Narrambla 1

Monthly Archives: November 2019

As we know both siblings fledged really well and were found together on the familiar roost tree earlier this week.   A colleague (Chitra Shanker, a visiting academic, with a very serious camera) and I have been having fun watching flying lessons around the tower and the roost trees.

Here is her picture of one of the adults flying, well beyond my photography skills:

Adult in flight

One of the juveniles (we think probably Pluto, based on size) has come back to the box and has been resting during the day. Here he is with Mum, Diamond.

Diamond and juvenile, probably Pluto

And the next day he came back.

this video shows Diamond leaving when he approaches and some ducking when an adult swoops from the top of the tower.


Here is one of the juveniles (probably Pluto) on the tower roof.  Note heart-shaped spots.



Juvenile in dead tree, probably Gaia. But also has heart-shaped spots! Photo by Chitra Shanker.

Have a lovely weekend.  Let’s hope some of that forecast rain evenutates.

And to avoid confusion, birds at this stage can be called eyasses, which simply means pre-adult birds, OR fledgelings, which means recently taken their first flight, OR juveniles as they have juvenile plumage.  There is no ‘fledgeling’ plumage, so it’s a stage rather than a look, if you see what I mean!

There are other definitions in use eg eyas often means unfledged, but is widely used for all young peregrines in the literature.  I’m sure falconers have their terminology as well, but their plumage can be affected by their diet in captivity!






I found Gaia this afternoon.  She made her way to the roost tree very quickly (as did Pluto) and with no dramas or help from me, fortunately.   I think the parents have decided this is a good area for them for flight practice and steer them here more quickly each year.    I think this must have been the easiest year for them (and me!).   I’ve included one of Pluto having a poo, as I know that will keep some of you happy.

Pluto left, Gaia on the right, together again after short separation



Gaia fledged at 7 weeks and 1 day (from 1st hatch) ie 43 days.  It was quite a good fledge, although she seemed to be on a downward trend to the right, so I think she landed not too far away.  I’ve been out with Chitra looking for them both this morning.    Found Pluto on the roost tree (not at all bad after such a short time), being guarded by Diamond (we didn’t go too close as I didn’t want to startle him into a flight for which he was not ready).  And we found Xavier on the tower, later in the nest box.   He didn’t bother us at all, but that doesn’t actually mean Gaia wasn’t close as he is much less aggressive than Diamond.  Still I was a bit surprised at his nonchalence as she can’t be far away!

Here is the link to the fledge:

And here are Diamond and Pluto on the roost tree, with some shots of the tree from a distance to give you an idea of the surrounds.   Sorry about the focus, the new camera is being a bit tricky and I was a long way away.   I’ve compressed the pictures, but haven’t ‘tarted’ them up in any way.


And not to be outdone, here is Xavier on and in the tower.


First fledge of the season and it was, as predicted, our male, Pluto at 41 days since hatching.   He flew true and strong and one of the adults followed him immediately.

Here is the link



It shows Pluto getting ready to leave, his leaving (and if you look closely, adult following) and Gaia’s non-plussed reaction!


Here are some screenshots of his take-off.







Here is Pluto, just a day before fledging:  And Gaia left behind (taken this morning).


Sorry I didn’t get them together.  Some years I’ve managed to get three in a row!

And, finally, here is Diamond’s angry reaction to my presence, yack-yack-yack etc.!   She was in a tree just opposite the tower.  I am assuming (but cannot be sure, of course) that she is guarding Gaia, not Pluto, as it is unlikely that he would have found his way back to the tower.   Nothing surprises me with these birds, however.  One year a male landed on top of the tower on his first day.

Await the next instalment with bated breath.

Firstly, apologies for no update last week from me.   I seem to get further behind each day!  Anyway, a longer one today to make up for it.

Only about a week before the first fledge is due.   By my calculation that should be about 13 November ie next Wednesday, but as you guys know, anything can happen. Sometimes one takes off early (usually, but not always, the smaller male) and some linger for days in the box.  I’ll be around next week to try and find them after fledging (in case they land in the car park, which happens!).

Note that if you are staff or student here at the uni, be careful as the female may attack you if she thinks you are too near the fledgeling.   My advice is to steer clear of the Girinyalanya area after the middle of next week! Or wear a hard hat….

The juveniles at Collins St., Melbourne are five days older than ours and have not fledged, but I expect them to do so any day now.

When they are due to fledge, the parents will try to lure them out and I expect fewer prey to arrive next week.  Mind you, that wouldn’t be hard with up to eleven prey coming in over the last week or so.  That is a deliberate tactic to make them a bit hungry and keen to come out and explore, so don’t worry if less food is forthcoming.

Now that the juvenile starlings are out, the parents, and particularly Xavier, are taking full advantage of these for the chicks.  And they are progressing well towards independence, often grabbing the prey from adult (especially, our greedy guts female, Gaia) and shielding it from the others.  Pluto is less aggressive, but is getting his share.  Here he is having a bit of a tug-of-war with his sister.   There is also considerable wing-flapping going on in the box, not to mention rock-climbing!

Our female Gaia is considerably larger than her brother, Pluto (well named, guys).   And was noticeably larger even at three weeks, when they are usually indistinguishable unless they are in the hand for banding when you can measure wing length etc.   So a big girl, or small chap!  Note also that males mature faster, so Pluto on right has more of his brown juvenile plumage than Gaia, who is still noticeably fluffy.


Larger female, Gaia, on your left, Pluto on the right

It’s interesting to ponder why females are so much larger (up to 50%) than their male counterparts.   In fact the name ‘tiercel’ comes from the older word meaning ‘one third’ ie that the male is one third smaller than the female.   I always thought this dimorphism was because she does most of the incubation, so needs to have a greater ‘spread’.  Males sometimes struggle to cover more than two or three eggs.  Other ecologists have put forward the view that it is because she can take larger prey (which is true, but doesn’t really account for the evolutionary question of ‘to what advantage’).  Another theory is that the male needs to be smaller because he is so aggressive and capable of injury while mating.  This is discounted by Derek Ratcliffe (The Peregrine Falcon, 1980) as unlikely to be the only explanation.  Perhaps it is a combination of these factors, with the nimbler male catching smaller prey and the larger female coping with the heavier ones, giving them a better spread of species, plus a size difference keeping the male in his place, so to speak.  I have to admit, I don’t really think of Xavier as aggressive.  He always demurs to Diamond!

The week before last I gave a talk about this project in Sydney to a group of interested Sydney-siders as they have a pair of peregrines using the Circular Quay area.  The tour was fully booked, mostly with families which was nice.  We tried to find the pair, and their nesting spot, without success, alas, then adjourned to the Customs House where I gave myPeregrine project talk for website I have converted this to a pdf to make it easier to download, but it means you won’t have the videos.   Just click on the link.

Now, one of our ‘fans’, Holly, has been making a lot of videos from the live streaming and clearly has a talent for this.   Here is her most recent offering – 30 Oct Highlights – You can also find her on Facebook and on her own Youtube channel, where she often adds music and other accessories.  Many others who follow the falcons do this as well ie have their own Youtube channels and upload videos to the Google Hangout which is linked to the chat.  the link to the hangout is then search for Orange CSU NSW Peregrine Falcons.

I have my own channel, too, but most of my videos are related to the research on the diet, so are recordings of prey items that I have not been able to identify.   If you have a nose for forensic detail, be my guest and have a go at identifying some!   they are all dated and named:

Anyway, that’s enough from me.  Have a lovely weekend.





There has been a family of peregrine falcons living in a Qantas hangar at Sydney airport for decades, it appears, but not until this week has there ever been a problem. An aircraft worker has been attacked and quite possibly permanently blinded after being swooped (that’s the really bad news). A number of media outlets reported the incident but I’ve included The Guardian newspaper’s version as it shows more photos (apologies for the extra rubbish ads and the fact it’s The Guardian; I know some people hate it!!).

Peregrine falcon attack in Sydney

Peregrine falcon attack in Sydney at QANTAS hangar

I find it amusing that a union member has decided it’s suddenly an “unsafe work environment”, after all this time! The more appropriate approach should have been to warn staff (as they should during every breeding season) of the possibility that the adults will protect their eyrie. The occurrence of magpie attacks in Australia is FAR more prevalent, and in total more damaging, on an annual basis. The difference between a magpie attack and a peregrine attack is that you can hear a magpie coming!! Methinks QANTAS are also jealous there’s a faster creature than some of their planes!!

This is a timely reminder that anyone who wants to go check out the peregrines up the water tower at Orange campus during their breeding season (i.e. Aug-Nov) needs to be alert to exceedingly fast flying objects – wear a sturdy hat, just in case.

November 2019
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