Have they, or haven't they?



Sea Eagle in flight - photo courtesy of Alan Jack

 This week we are playing the waiting game. Our egg(s) are due to hatch any time now and everytime the on-duty adult stands up on the nest, we wait with baited breath to see a tiny, wobbly white head, or the other adult bringing in food.

Yesterday afternoon the weather was superb (as it has been for over two weeks now), and the conditions were perfect for a precious Sea Eagle chick to come into the world. But the adults seemed to be just turning the eggs and then settling down to incubate again.

Maybe they could hear the first chick cheeping inside the egg as it started to break its way out using the tiny egg tooth on the top of its beak. Or maybe not! Eggs can easily take 36 hours to hatch, so, like Iona and Fingal, we must be patient and wait for that first feed!

We can't help thinking back to last year, when the beginning of May saw horrendous winds sweep the west coast of Scotland, and the eagle nests were all checked the next morning. We were convinced that at least one nest tree would have come down, but no, everything was intact and Mull's Sea Eagles successfully fledged 11 chicks in 2011.

We suffered even stronger winds over the winter months with one gust on Mull recorded at 165 mph. Surely some of the eagles would have to build new nests this year to replace those damaged? Sea Eagles are obviously better nest builders than we give them credit for as most nests survived. One nest did collapse and the following day the eagles there carried out a hurried repair job - only for the winds to return and the new nest be blown out of the tree too. But Sea Eagles are resilient birds and it's always surprising to see how quickly they put their nests together.

The new "wild hide" - photo courtesy of Alan Jack

Our new viewing hide, set into the woodland, is proving a huge success. Everyone says they feel closer to nature, and the smell from the pine trees is all-pervading. The shading at the front of the hide means that the eagles can't see us although they know we are there.

Occasionally they will hear something and if we happen to be looking through a telescope at the time we see a beady pale lemon eye staring back at us.

With luck we will soon be watching food being brought in for the chick(s) by the parents, and then tiny slivers will be torn off and fed tenderly to their offspring. I wonder if we'll have a hatching today?

Exciting times!

Another beautiful day at the hide - what a week it has been! With clear blue skies and thermals rising, Skye and Frisa have been giving us some fantastic displays. On Tuesday Frisa drifted over the top of the hide, caught a thermal and spiralled up and up until she was no more than a dot in the sky, with never a wing beat. It must have been wonderful for her to stretch her wings after a long spell on the nest.

Talking of the nest, we are all on tenterhooks as we wait for the egg(s) to hatch. Today is day 36 of an average 38 days of incubation and the birds have been quite fidgety on the nest, which is a possible sign that a chick is getting ready to hatch. It can take 36 hours from the time the egg first pips to the time the chick hatches, but even before it pips the adult birds can hear the chick calling inside the egg and will sometimes call softly back to it to encourage it to start to break out. The chick develops with an "egg tooth" - a tiny sharp bit on the top of the beak which it uses to tap away at the shell from inside until it breaks. It then works its way right round the egg until the top falls off and it can struggle out - damp and bedraggled and small enough to fit into a human hand. It's tiring work, but the adult bird will keep encouraging it with gentle calls.

The chick hatches with the remains of the "yolk sac" inside it and spends up to the first 12 hours of its life outside the egg absorbing the sac and all the goodness within it. Then it will start to call for food and that's when the adults' hard work really starts. To begin with one adult will continue to brood the chick (and the remaining egg if there were two), whilst the other hunts and brings food back to the nest. Then the adult will stand over the chick with its talons bent underneath its feet to avoid standing on the chick, and will tear tiny strips of food from the prey with its beak which it offers to the gaping chick. It is the most amazing thing to see - such an enormous bird caring so tenderly for its young. By day four the chick's egg tooth will have disappeared, it will have dried out and be covered in pale grey down. The adults will continue to brood the chick(s) for two to three weeks while their adult body feathers are coming through and they are less susceptible to the cold, but if the weather turns cold and wet the adult birds will make sure that the chicks are kept warm.

Both adults hunt to feed the chicks, taking turns at feeding, brooding or just perching close by "on guard". By the time the chicks are ringed at around eight weeks old they are fully grown and spend the last three or four weeks in the nest growing down their flight feathers and practising wing flapping exercises ready for their first flight. It is an incredible growth rate. As with most birds of prey, female sea eagles are larger than the males, and it was strange to see last year's female chick, Heather, perched next to her father and looking down on him when she was only three months old.

As yet we don't know whether we have one or two eggs, so we will be watching with bated breath over the next few days to see how many little heads pop up in the nest. As the eggs are laid two or more days apart, there is an equivalent gap in their hatching, so we probably won't know until this time next week how many chicks we have. Watch this space!

If you read my last blog about Operation Easter, I can give you an update on our oldest pair of sea eagles on the island. Their first chick hatched on Monday, so we are waiting now to see whether they are feeding one or two chicks. It really is amazing to see how this pair keep going - last weekend there was a major grass fire just half a mile from where they are nesting, yet despite the activity with three fire engines and their crews working hard to put out the fire, the birds kept calm and stayed put. I've been privileged enough to watch this pair for over 10 years now, so have become very attached to them.

Fingers crossed for Skye and Frisa and their offspring - I'll keep you informed.