Wildfowl & Wetlands Trust (WWT)

Still sitting…

Our resident Ospreys are still sitting tight on their two precious eggs despite the wilder turn of the weather- in fact such cool and stormy conditions are when their diligence is most important to keep the eggs warm. For those of us viewing the live nest camera on site though, the high winds rocking then nest back and forth can make you feel a little seasick! Despite being exposed to the elements Ospreys almost always prefer such high tree top nesting sites – prefferably with 360 degree views- for security.

Both birds have again been sharing incubation duties, and the male this morning seemed very reluctant to hand over to his mate on her return- he is certainly a proud father, or perhaps just too comfortable sitting snug on the nest.

Interestingly we have not been seeing the male bring many fish back to the nest- instead the female seems to be fishing ,at least partly, for herself during her turns off the nest. This will change though as soon as the chicks are hatched , when all responsibilty for keeping the family fed will fall on the male.

Another two weeks of waiting to go…

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Third week of incubation

We are entering the third week of incubation of our two osprey eggs here at WWT Caerlaverock. The eggs are incubated for an everage of 37 days and during that time our adult birds will diligently turn and rotate them regualrly to ensure even developement for the embryos inside. It is amazing to watch these big birds walk around the nest with their huge talons curled in under their toes to avoid breaking the eggs. Both adults have been taking turns with incubation duties- the male is just as willing it seems to sit on the eggs, which is not the case in every Osprey pair. Thier vigilance is essential not only to ensure an even temperateure for the eggs but to protect them from opportunistic predators during this period.

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Incubations continues

Our ospreys are happily incubating their two eggs on the nest today and no doubt enjoying the beautiful spring weather. The eggs were laid on the 19th and 22nd of April and it now looks unlikely they will be joined by a third egg this year, as it has been more than a week since the second was laid, which is usually the maxmium gap between eggs.

However, two eggs is still a great outcome and most welcome as this is a relatively young breeding pair, and every Osprey born here in Dumfries and Galloway potentially helps these still vulnerbale birds recolonise their historic range. If both eggs hatch the two chicks will stand a very good chance of both surviving to fledging as there should be plenty of food to go around.

Osprey eggs hatch between 35 and 42 days after laying, with a pretty reliable average being 37 days. Some quick calculations reveal therefore that the earliest possible hatching date for egg one would be the 24th of May, but more likely the 26th, whereas egg two could hatch as early as the 27th, but more likely around the 29th of May.

Meanwhile the parent birds continue to be dedicated and vigilant as the eggs must be kept constantly warm and protected from opportunistic predators during the long incubation

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Osprey Easter egg number two laid this morning

When the CCTV images came on this morning we could see AW stand up on the nest and between his legs there were 2 eggs. If we didn’t know better it looked as if he had just laid them! A second lighter and more speckled egg was beside the very russet first egg clearly visible in the nest cup. Soon after the female arrived to take over and AW flew off. They changed over another 2 times before noon. No sign of any fish yet this morning. I will try to get some images today from the CCTV system as the weather and the images are very clear.

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No sign of egg number two yet

It looks hot on the osprey nest today as the birds bask in the spring sunshine. AW has flown in to take his turn on the nest 3 times today, once with a fish for his mate. We have also seen a mating attempt on the nest this morning, a precarious operation as the female sits on the egg! By 4pm this afternoon there was still no sign of a second egg, hopefully later this evening or tomorrow morning.

Good news from AWs home at Wigtown Bay, HD & EP have a clutch of 3 eggs.

More good news from NTS Threave, 5 ospreys were seen at the nest site yesterday and the regular pair sat tight on the nest till the 3 interlopers flew off.

Dumfries & Galloway is fast becoming a great place to watch opsreys with three very different viewing sites. here at Caerlaverock we have live CCTV from the nest and a chance to see the birds fishing in the Solway. At NTS Threave near castle Douglas you can actually see the nest from a special viewing platform near the castle and at Wigtown bay there is one of the best CCTV systems beaming live images to the Town Hall viewing room. There are also other birds about so you never quite know when you may see one of these spectacular birds in this area.

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Yet more sticks and more mating

Over the weekend we have seen both ospreys bringing in more sticks to the nest. AW as ever is a bit optimistic in thinking he can find the final resting place for his sticks on the nest. His mate rearranges his endeavours as sooon as he leaves. There have also been more mating attempts on the nest so things are looking good for an egg sometime soon, hopefully before the end of the week. Our pair are always a bit later than others, some of whom are already on clutches of 3. AW’s mother at Wigtown Bay laid her first egg of the season on the 15th and the second should be very soon. We have also seen good views of AW’s tail feathers over the weekend as he perches on the branch holding the CCTV camera at the nest. Thankfully the black plastic does seem to have blown away and no more has been seen. Just after midday today I could see an osprey perched on driftwood just off Saltcot merse and it looked to be eating a fish. It was too far away and too hazy to see if it was a ringed bird.

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Expecting eggs

We are all eagerly expecting eggs to be laid by our osprey pair in the next few days. There has certainly been plenty of matings and lots of nest additions and ‘cup scraping’ which are all good signs of the birds being well bonded to the nest site and being ready to lay. Luckily it looks like the black plastic which was adorning the nest has gone as it could pose a real risk to chicks, by entangling or smothering them which has happened elsewhere.

Visitors have been asking how we will know which of the two male birds may be the father of the eggs and whether there is any risk of the male AW destroying them if the are his rivals’ (as happened at Loch Garten a few years ago). The answer is all in the timing- ospreys generally lay eggs 7-10 days after mating so if any had appeared last week we’d have know they were fathered by the first male. Since the 7th of April only AW has been mating with our female ,so if the eggs are laid from now on, they will be his. Let’s hope thats the end of any domestic dramas for the year!

Osprey eggs have now been laid at several UK sites this season, such Wigtown Bay, Glaslyn, Tweed Valley , Loch of the Lowes, and Loch Garten, so hopefully our birds will join the list very soon.

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Nest building and more black plastic

Both ospreys have been bringing in sticks to re profile the nest and as usual have brought in some blck plastic. As in previous years this discarded silage wrap gets woven into the nest and can flap about in the wind. We are always concerned that it may get tangled in tallons or wrap around chicks or eggs. This morning both birds were on the nest first thing but by 10am both were not seen on the CCTV however it looked like the female was siitting on the perch above the camera as we could see tail feathers appear evey now and then. The sunshine and warm weather has given way to wet and breezy conditions. Hopefully we will see the nest completed soon and eggs on the way.

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Spring has sprung!

Don’t you just love this time of year! Arundel is beautiful throughout the seasons but the start of Spring fills us all with excitement and anticipation as signs of new life start to pop up all around the grounds.

Look out for our new column in the Chichester Observer written by our Grounds Manager, Paul. His weekly piece follows his walks around the reserve, highlighting seasonal changes and offering an insight into the secret side of Arundel. I thought I’d poach an excerpt from this week’s column to give you a taster…

“Continuing up the path I check the black thorn hedge for eggs of the brown hairstreak butterfly. These eggs overwinter on a branch fork between new growth and the past years growth. The bright white eggs are small and have intricate elaborate structures. Get a magnifying glass for an up close amazing view. The black thorn is budding now and will soon be white with flowers. The leaves appear in April, ready to feed the brown hairstreak caterpillars. Brimstone butterflies were spotted onsite last week. They hibernate as adults, the males appearing earlier than the females. The story goes that the word butterfly is derived from the ‘buttery’ bright yellow appearance of the males. The females are more greenish yellow in hue and lay their eggs singly on the leaves of buckthorn shrubs.”


Brimstone Butterfly by Paul Stevens

“I hear a peregrine cry a mating call from the hanger above the reserve and watch him displaying for his mate before dropping down into the hanger. With the binoculars I find him, spotting his slate grey back parked in a dead tree. I stay and scan for the female I know must be nearby. My patience is rewarded as I find her in another tree 20 yards down, ripping at prey, white feathers drifting downwards. She is larger than the male, as is the case with most female raptors, and can bring down larger prey like pheasants and mallards. He will hunt small ducks and both will easily grab pigeons. The male soon flies over to join her and watches her eat.”

Spring is most certainly in the air in the collection areas too. Three pairs of Nene are sat on eggs in the World Wetlands and North America exhibits, fingers crossed they will have more luck than last year when heavy rain and spring tides caused water levels to rise, flooding out nests leaving them abandoned. Last year, one female Nene was bred successfully and she is now all grown up. She won’t be looking to pair up until she’s about 3 or 4 years old but she has made friends with a couple of the younger males now that she’s no longer with her parents.

A couple of weeks ago the Scaly-sided Mergansers provided a talking point during the daily diving bird feed. They were rather publicly showing their love for eachother throughout the whole feed which I’m told had a fairly young audience that day… I think some parents may have had to have the ‘birds and the bees’ talk following their visits!

The beautiful Coscoroba Swans are also sitting on eggs, as of yesterday she had two. Last week, they were delighted when Sam, our new Grounds Supervisor, provided them with a pile of chopped reeds. They immediately got stuck in, throwing the reeds around to construct their nest on the same island where they nest every year. Sam was very amused to find that when they turned their backs a Puna Teal snuck in and made herself cosy in the huge nest, I think she was evicted fairly sharpish!


Coscoroba Swan by Tony Hughes

On leaving work late last Thursday I encountered a large toad sat in the middle of the car park. She sat there frozen in my headlights and allowed me to pick her up and move her to safety. When I came into work the next day I mentioned it to Paul and he smiled, pleased to hear that the toads were making their annual trip back to the reserve to spawn. Apparently they have a few favoured places including the entrance pond and Wetlands Discovery. I didn’t realise that toads can live for around seven years and it’s amazing to think that some may have returned to Arundel year after year. Paul sent me this lovely photo taken a couple of years ago when one female found her way into the box where the milkman leaves our deliveries!


Female Toad by Paul Stevens

Right, I think I’ll go and grab some lunch, I might take a stroll out to the Sand martin hide where two pairs of Lapwing are becoming a permanent feature so fingers crossed they’ll breed again too this year.

Liv

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