Skip to content

SANParks.org Forums

View unanswered posts | View active topics






Post new topic Reply to topic  Page 1 of 2
 [ 24 posts ]  Go to page 1, 2  Next
Author Message
 Post subject: Crane, Blue
Unread postPosted: Thu Dec 08, 2005 8:27 pm 
Offline
Senior Virtual Ranger
Senior Virtual Ranger
User avatar

Joined: Sun Sep 04, 2005 7:10 pm
Posts: 1451
Location: Golden Mile,West Coast, CFG
WTM, it's time to pick your bird brain again :D

Do all Blue Crane pairs have two chicks?
At what age do they get those lovely long secondary feathers?
How old where the approx.30cm high chicks I saw?
How on earth does such a tall bird feed those tiny chicks? :shock:


Last edited by Jay on Wed Sep 05, 2007 9:07 pm, edited 1 time in total.

Top
 Profile  
 
 Post subject:
Unread postPosted: Thu Dec 08, 2005 10:41 pm 
Offline
Virtual Ranger
Virtual Ranger
User avatar

Joined: Fri Aug 26, 2005 2:28 pm
Posts: 392
Location: JHB
Hi Jay
Blue cranes on the norm lay two eggs, every now and then 3 are laid but very seldom are 3 born. Normally 2 are laid and very often only 1 survives.
As far as the age of the secondaries and how old the 30cm chicks are I can't help you there.
As far as feeding goes Cranes have the the ability to bend their knees 90 degree the opposite way to us humans can and can therefore get down very low (Normally only when resting), they also simply bend their long necks down and feed cicks that way.


Top
 Profile  
 
 Post subject:
Unread postPosted: Fri Dec 09, 2005 6:21 am 
Offline
Legendary Virtual Ranger
Legendary Virtual Ranger
User avatar
Award: Birder of the Year (2013)
Joined: Thu Dec 02, 2004 10:27 am
Posts: 5250
Location: Chasing down the rarities
Taken recently...
Image

My friend Snoobab have answered many of the questions.

Hereis some interesting reading material for those wanting to read more about this endagered species.

I do unfortunately not have all ther answers to your questions, but I have emailed A blue crane specialist in the Overberg to ask his help on your questions. And will let you know as soon as I hear something from him.

Something interesting I read...
Quote:
Two young are often reared together, which is surprising. In captivity, recently hatched crane chicks show an astonishing level of aggression that will lead to mortality if they are not separated. This behaviour dissipates after a week or so and is similar to the siblicide (or 'Cainism') shown by some of the larger birds of prey. In the wild, keeping the small chicks mobile may circumvent the problem: the young are led away from the nest virtually immediately after hatching. 'Brood-splitting', another feature of some rallids, whereby each parent takes responsibility for one of the young, may also be involved as a solution. But why this innate killer instinct is present at all still requires explanation. Blue Cranes will protect their young with startling distraction displays, spreading their wings and feigning injury, like giant plovers. They are apparently also fearless in attacking medium-sized predators, such as dogs, that threaten their families, and their rapier-sharp bills are not to be trifled with.


Kind regardsWTM

_________________
656
Latest Lifer(s): White-winged Flufftail, Dickinson's Kestrel, Senegal Coucal, Three-banded Courser, African Broadbill, Thrush Nightingale, Rufous-bellied Heron.

Follow me as I bird on Twitter @wildtuinman


Top
 Profile  
 
 Post subject:
Unread postPosted: Fri Dec 09, 2005 9:44 am 
Offline
Senior Virtual Ranger
Senior Virtual Ranger
User avatar

Joined: Mon Dec 05, 2005 1:43 pm
Posts: 749
Location: Jo'burg
Those long feathers are actually tertial feathers and not secondaries. They develop at 1 year.

Here's how tall the young birds are:
3 weeks: 350 mm
4 weeks: 550 mm
5 weeks: 700 mm
5-6 weeks: 66% of adult height
Full adult height at 10 weeks

So the chicks you saw could have been no older than 3 weeks.

An interesting fact about Blue Crane chicks is that they atually call from within the egg up to 24 hours before they break through the shell. I don't know how they manage this but it is a well documented fact.


Top
 Profile  
 
 Post subject:
Unread postPosted: Fri Dec 09, 2005 7:53 pm 
Offline
Senior Virtual Ranger
Senior Virtual Ranger
User avatar

Joined: Sun Sep 04, 2005 7:10 pm
Posts: 1451
Location: Golden Mile,West Coast, CFG
Thanx everyone :D you've shed some lotsa light on the subject.
Ofcourse I am going to look out for the little chicks(3wks old) and the bigger ones(5-6wks old), but will most likely not see them again as the wheat fields are huge areas :( , but reckon I was very lucky to see the two lots within a few days of one another!


Top
 Profile  
 
 Post subject:
Unread postPosted: Sat Dec 17, 2005 5:34 pm 
Offline
Junior Virtual Ranger
Junior Virtual Ranger
User avatar

Joined: Tue Apr 19, 2005 4:51 pm
Posts: 503
Location: Kleinmond, Western Cape
It may sounds like bragging - but I was fortunate enough to see two (wild) blue cranes walking among the fynbos behind our house this morning. I've heard them on numerous occasion when flying over (and saw them in the air). But this morning was the first time that we actually saw them in the veld behind our house.

_________________
Chris Boucher


Top
 Profile  
 
 Post subject:
Unread postPosted: Sat Dec 17, 2005 6:05 pm 
Offline
Senior Virtual Ranger
Senior Virtual Ranger
User avatar

Joined: Sun Sep 04, 2005 7:10 pm
Posts: 1451
Location: Golden Mile,West Coast, CFG
You are supposed to brag about seeing birds Stoffel :wink:
I've kept a look out for those chicks but hav'n't seen them again, but I did see the pair of secretary birds, also in the fields behind my house :D


Top
 Profile  
 
 Post subject:
Unread postPosted: Mon Sep 03, 2007 1:34 pm 
Offline
Virtual Ranger
Virtual Ranger
User avatar

Joined: Mon Jan 24, 2005 4:12 pm
Posts: 519
Location: what does spinning mean? :-|
Image


Top
 Profile  
 
 Post subject:
Unread postPosted: Thu May 08, 2008 9:04 am 
Offline
Virtual Ranger
Virtual Ranger

Joined: Wed Nov 09, 2005 10:55 am
Posts: 2312
Location: Centurion
Was very exited to spot my first wild Blue Cranes on Monday on returing from the North Coast.

Between Utrecht and Newcastle I spotted the birds in a mealie-field. My husband had to make a U-turn on a very narrow and busy road and was of course not at all impressed, but it was all worth it! They were quite a long way off, but through the binoculars we counted 15 birds!

Nice, hey!?


Top
 Profile  
 
 Post subject:
Unread postPosted: Thu May 08, 2008 10:53 am 
Offline
Legendary Virtual Ranger
Legendary Virtual Ranger
User avatar
Award: Birder of the Year (2013)
Joined: Thu Dec 02, 2004 10:27 am
Posts: 5250
Location: Chasing down the rarities
naomi c wrote:
Nice, hey!?


Very nice! Did you perhaps come across any of the other cranes as well?


Top
 Profile  
 
 Post subject:
Unread postPosted: Thu May 08, 2008 11:02 am 
Offline
Virtual Ranger
Virtual Ranger
User avatar

Joined: Mon Oct 17, 2005 1:47 pm
Posts: 327
Location: Eish !
My closest Blue Cranes are the ones at Austin Roberts. :lol:

But, I've also seen some real wild ones on that road that leads to Cape Agulhas, quite far away.

_________________
Life is uncertain - eat your dessert first.


Top
 Profile  
 
 Post subject:
Unread postPosted: Thu May 08, 2008 12:01 pm 
Offline
Virtual Ranger
Virtual Ranger

Joined: Wed Nov 09, 2005 10:55 am
Posts: 2312
Location: Centurion
@ WTM

Unfortunately not!! Have not seen either of the other two in the wild.

How about you?


Top
 Profile  
 
 Post subject:
Unread postPosted: Thu May 08, 2008 12:06 pm 
Offline
Legendary Virtual Ranger
Legendary Virtual Ranger
User avatar
Award: Birder of the Year (2013)
Joined: Thu Dec 02, 2004 10:27 am
Posts: 5250
Location: Chasing down the rarities
My SO and I went out looking intensely for them in the Midlands Meander(a very good pozzie to find them at) earlier this year, but to no avail. I only have the crowned crane and the blue crane. The wattled crane still eludes me. :(


Top
 Profile  
 
 Post subject:
Unread postPosted: Thu May 08, 2008 1:43 pm 
Offline
Honorary Virtual Ranger
Honorary Virtual Ranger
User avatar

Joined: Fri Jan 14, 2005 5:42 pm
Posts: 17943
Location: Red sand, why do I keep thinking of red sand?
Jay wrote:
You are supposed to brag about seeing birds Stoffel :wink:

Ah! With the current weather here there are tons of birds enjoying a drink at the terraces, and me enjoying the eh... sights! :lol: The Dutch girls are the most beautifull in the world!

But I can also brag about seeing the Blue crane in the wild. :dance: Unfortunately I was at the time taking panoramic photos, so did not have my long lens with me. :cry: But even with 105 mm they are easy to see in my photos, and IDable. (New word, 11 times wordvalue.)

_________________
Arriving currently: The photos from our trip! Overhere! :yaya:

Feel free to use any of these additional letters to correct the spelling of words found in the above post: a-e-t-n-d-i-o-s-m-l-u-y-h-c


Top
 Profile  
 
 Post subject:
Unread postPosted: Sat Jul 05, 2008 3:00 pm 
Offline
User avatar

Joined: Thu Jul 03, 2008 11:05 am
Posts: 2
The first time a saw our national bird in the wild was in Etosha National Park in Namibia; a bit disturbing that thought - but a nice citing anyway. The Blue Crane population there is isolated (i.e. its the only place in Namibia where they are resident) and consist of 60 to 80 birds. [/img]


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 24 posts ]  Go to page 1, 2  Next



Who is online

Users browsing this forum: WELSH_ASH and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group

Webcams Highlights

Addo Nossob Orpen Satara
Addo Nossob Orpen Satara
Submitted by Jurie van Vuuren at 12:26:03 Submitted by grannyb at 18:43:20 Submitted by vinkie at 19:33:11 Submitted by Anonymous at 09:31:24