Thanks Gaby, Arthur, Tim and Ken!
Yes, Ken, I agree - I'll give it a go over time. Sketching from the live birds will of course take priority when the weather is conducive...which in fact it is today. Other than a big of a breeze - well, ok, maybe more like a not-too-strong wind - it was a gorgeous day to go to the falls and sketch. Which I did...
The female looks bored already with the prospect of a continued few weeks of incubation - she alternated between looking around rather aimlessly and nodding off for minutes at a time.
Another observer believes there are three eggs at present, not four, so I'll assume that three is correct unless verified to be different than that. The female was incubating the whole time I was there (about 10:10 to 11:30), so didn't get any look at the eggs at all. So I sketched the female on the scrape, as best I could with her eyes open. It was nice to have the luxury of time to sketch her - obviously not the typical 'blink your eye and they're gone' scenario that so challenges us with live birds as models. However, even when she was 'still' she really wasn't for very long. She alternated between eyes closed for a power nap, eyes open and looking around, and a variety of head angles that changed fairly quickly. So I tried to do the direct front-on view without screwiing up the foreshortening too badly. I'll hopefully have plenty more days to practice this until it gets harder when the youngsters are hatched and don't need quite as much constant attention from the parents.
The observers for the past years have told me that food transfers (mid-air spectacles) often happen in mid-afternoon, so I'm going to try to get down there not only in the morning, but also in the afternoon. The light on the subject is better in the afternoon as well.
This is in the 15 x 11 sketchbook in graphite.