Another tagged eagle has turned up

28th July was a red letter day for me. Megan Murgatroyd who did her PhD on the Black Eagles in the Cederberg and Sandveld is now engaged in a post doc project which requires satellite tagging adult Black Eagles. On this particular day she was at a nest cliff in the Overberg, when she noticed one of the eagles’ was tagged and immediately sent me the picture below.

I have been monitoring this nest since 2007 and it seems there has been a change of mate. This happens more frequently than we realise and this time it was quite obvious with the tagged eagle turning up. He seemed quite at home as shown in Megan’s pictures below.

The number on the tags, N004 identify him as the chick we tagged on the 31st August 2010 at another nest near Botrivier.                                                                                              The chick was 54 days old and weighed 2,975 kg.

This is the first time I have heard of it being seen again, so I do wonder where it has been these last seven years. It will be the first time I have a tagged eagle as one of a resident pair. They are not breeding this season and it’s likely the arrival of the tagged male interrupted breeding this year. However they seem pretty established as a pair, so we are hoping for the best next season.

When Megan set about trapping an eagle at this site, both adults came down onto the trap. The satellite tag was fitted to the female, but trapping the male gave us a good opportunity to check the condition of the tags and evidence of damage to the wings or plumage.           As a seven year old adult he now weighs 3.8kgs; the female weighed 4.8 kgs .

although the tags are very mobile and often flip up and down and turn around during flight, the pictures below show that it causes no damage to the eagles’ plumage and no injury or scar tissue on the skin.

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wing tagged Black Eagle spotted in Bains kloof!

This was the exciting news I received on Saturday 22nd April in an email from Margaret Caetano. It was seen by her son Judah about a kilometre from the camp site at tweede tol. These pictures were taken by Judah.

Over the years I have wing tagged 28 young eagles at their nest about a week or so before they fledge. The eagle Judah saw is the 8th tagged chick re-sighted since fledging.

We tag chicks in the hope of finding them again and learning more about where they go to after they leave their natal territory. It’s a hit and miss affair. Wing tagging is perfectly safe, but one cannot track the eagles’ movement. One has to rely on people like Judah to spot tags. Satellite tracking is far more effective, but also far more expensive and its inherently far more risky to literally strap a tracker onto an eagle. much like we would put on our backpacks. albeit that the trackers are very lightweight. Nevertheless eagles and in particular Verreaux’s (Black) Eagles regularly engage in breathtaking swoops, pendulums and somersaults as part of their display when they are either marking their territory, intimidating a rival, trying to impress their mate or just celebrating a great day. So there is the over riding concern about fitting a backpack that can remain in place during these energetic manoeuvres. When the air is right, they fly, that’s what’s so magical about the Black Eagle.

The eagle Judah spotted is a female. We could tell by her weight, over 4 kgs as a near to fledge chick on the nest. She was tagged on a farm in the Akkedisberg which lies between Caledon and Stanford. I started monitoring this pair in 2007 , a year or two  after an extensive fire ravaged the mountain.

this is what the mountain looked like in 2007, two years after the fire

The eagles had not been breeding for several years. They attempted in 2009 and 2010, but failed. No eggs seen on the nest and no chick. Since 2011 however they have been producing a chick every single year and the tagged eagle Judah saw is a chick, we tagged in August 2014, which makes this eagle three years old, going into her 4th year.

tagging the chick August 2014

this is the chick back on the nest after we had tagged it.

 

  • Its generally accepted that Black Eagles take four years to reach breeding age, so it’s likely she has not found a mate yet. Should she have had a mate Judah would have seen another eagle close by. Black Eagles come in pairs. Where there is one, the other should be close by, unless its what we call a floater. This means its an eagle still looking for a mate and a territory.
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Silvermine

 

The Silvermine nest site has been a heart ache for me since July 2013 when one of the adults went missing, presumed killed, hopefully by accident and not by human hand. The tragedy was compounded by the fact that the pair had a week old chick on the nest.          The remaining adult did not pay any attention to it and as a result it died of neglect.  However the good news is, at long last we have a newcomer, which has been seen in the company of our resident eagle since January. First reports of a pair of Black Eagles seen on consecutive days above Kalk Bay and a day or two later above Cecelia Forest and then Noordhoek Peak, had me literally commuting on a daily basis up to the Silvermine lookout. I have seen them on two occasions. The newcomer is a subadult and time will tell whether it is old enough to breed. Black Eagles take four years to mature into adulthood; nevertheless I’m told that younger eagles have been known to breed. The pictures below were taken by Andrew Jenkins at Silvermine on the 25th February.

NHoek VE2_4 (1 of 1)

NHoek VE2_5 (1 of 1)

These are the pictures of the newcomer and below of the resident eagle.

NPeak VE (1 of 1)

NHoek VE1_6 (1 of 1)

and here they are both on the nest

NHoek VEPr (1 of 1)

 

 

 

 

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2014 breeding season; first news

Our Botrivier pair seems to be first to have hatched their 2014 chick. I received a call from Eric Pietersen, Kogelberg Ranger on the 26th May to say he was at the cliff and looking at a tiny white chick in the nest. (no picture yet unfortunately)

By now most of our pairs should be on eggs.

The West Coast pair certainly is and below is a picture Mariana Delport took of the female on the nest on Sunday 1st June.

tn_Verreaux's Eagle on nest - Langebaan 01.06.2014

more news from the west coast region is that last year’s chick has been spotted several times around Postberg in the Langebaan Nature Reserve.

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More nest cam action

Our second Black Eagle nest camera was set up at the Porcupine Hills nest on the 9th September 2013 at the same time the nestling was tagged. We only returned in April, to retrieve the camera and I have selected a good sample from over 7,000 pictures to provide some insight into the activity that occurs between long quiet spells where nothing happens except for the chick to shift position, stretch a leg or wing or fiddle with some nesting material.

Below are the first two pictures taken by the camera just after the chick was placed back onto the nest after tagging. A partially consumed Egyptian Goose was found on the nest.

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About two hours afterwards, the female paid a visit and fed both the chick and herself on the remains.

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our biggest surprise was the next prey item brought onto the nest

Porcupine Hills (2)

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I am told it is a grey rhebok calf that weighs in the vicinity of 5-6Kgs. In all likelihood the animal  was caught above the nest so that the eagle could glide down onto the nest with its prey.

Rhebok are usually associated with hilly/rocky areas, but they have been seen amongst the wheat fields of Caledon and then often on plateaus and valleys in the mountains. Porcupine hills is situated in a relatively shallow area and therefore one could conclude that they were grazing on some steep slopes.

Another explanation put forward that I am not entirely sure I agree with but cannot rule out is “the possibility of the calf being plucked from lower ground as the eagles have massive power and it has been recorded that they do molest(interpretation can be debated upon) antelope in general.”

I was very surprised when 24 hours later all that was left on the nest of the young calf were the hind quarters.

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the adults must have managed to somehow separate two thirds of the carcass and remove it from the nest. Activity that the camera did not pick up.

A few days later it rained and I thought it would be interesting to note that prey can be caught in the rain as the following sequence of picture show.

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I regularly come across pictures like these where I am sure the eagles are aware of the camera. Its operation is entirely silent and the infra red flash at night emits no light, however there must be the faintest of buzzing or clicking that the eagles pick up.

And below judging by the size of its crop, an entirely replete chick.

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Other prey items brought to the nest:

Red Rock Rabbit?

Porcupine Hills (4)

and another rabbit, less red this time

Porcupine Hills (5)

I am not sure if the following sequence of pictures are of the remains of an Egyptian Goose or perhaps another aquatic bird…..

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It was interesting to note that during the three weeks the camera was taking pictures no dassies featured as a prey item. We hope to set up another camera this next season and compare prey items brought to the nest.

 

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some pictures from our first nest cam

Late into the breeding season we set up two nest cameras at the stage the chicks were ready for tagging. This exercise was undertaken as a test run and we are hoping to learn how best to programme and set up the camera for the 2014 season when I hope to set two up at the beginning of the breeding season.

Below is a small selection of the first camera we retrieved from the Boskloof nest.

VE ad and chick on nest

the female arriving on the nest after we had returned the chick to the nest after tagging

hare on VE nest

the chick inspecting the remains of a hare delivered onto the nest by one of the adults

dassie on nest

remains of a dassie on the nest

Below are two images taken at night with an infra red flash

few days later exposure fine

we found that both adults join the chick on the nest at night.

ad and chick exposure fine

 

 

 

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2013 breeding season: pictures to share

Every season I receive many pictures from people who voluntarily give of their time to watch over our Black Eagle pairs and I would like to post some of them here.

The West Coast nest is a source of many pictures.

The chick fledged early October and has in the past stayed in the immediate vicinity until late March early April.

Below is a sequence of pictures taken by Tony Templer on the 15th January 2014.

The female was feeding on the second nest that the eagles do not use for breeding.

She was soon spotted by the juvenile and it was not long before the chick claimed the food as its own.

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TT 150114 (2)

TT 150114 (4)

TT 150114 (3)

further pictures of the 2013 West Coast chick:

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and the most recent one taken by Marianna Delport.

tn_Langebaan Verreaux's Eagle - Y020 Marianna Delport

95 kilometres further south, our only tree nesting pair in the Paarl area produced a chick for their 3rd successive year.

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Another of our nests, belongs to a pair that has been resident at an unusual formation of sandstone cliffs near De Hoop Nature reserve. Breeding records for this pair date back as far as 1959. In recent years though, this pair has struggled. They raised a chick in 2007 and thereafter failed year after year until 2013 when they again succeeded. Kevin Shaw took this picture below. It illustrates the strange beauty of the cliff. Can you spot the nest with a large feathered chick on it?

02102013 K Shaw

below is the cliff section with the nest on it enlarged, to show the chick.

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Wessel Uys watches over a pair in the Baviaansberg in the district of Ceres.

Pictured below is one of the two nests they use. The nests are situated on two small cliffs, one on either side of a narrow ravine.

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the picture below shows a small white chick on the nest with an adult.

The following pictures shows the second adult flying onto the nest as well.

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