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I so love using minimal brush strokes to capture waterbirds.
The Anhinga, or Snake Bird, is one of my favorites. It's very calligraphic and begs to be sketched with a brush.
I was looking through my old sketchbooks the other day and ran across this demo I did during a workshop. The blue sketch was made with an Elmer's Watercolor Brush Pen. They come in assorted colors. You can see a few strokes of different colors above the Anhinga. The sad thing about these pens is that when the color is gone you toss the pen.
The foreground Anhinga was sketched with a Pentel Pocket Brush Pen
At JetPens (link above) it has 'for Calligraphy' tacked onto the end of the name. At Dick Blick, that specification is left off. This brush pen comes with a refill cartridge and you can also purchases refills separately :) I love the texture you can achieve with this brush pen - almost a dry brush look. If you let the ink set up for a minute or so, it becomes waterproof. Or, if you are quick, you can stroke the pigment with a waterbrush and create diluted grays. You can view this technique here
The bulk of the Anhinga's body, neck and head were made in one stroke... takes a bit of practice but that's all part of the fun. If I remember correctly, I began by pressing the brush into the paper to create the bird's body and then lifted up to thin out the stroke until the brush was barely touching the paper for the bill. Practice pressure strokes with this instrument. Lots of pressure gives a bold stroke, light pressure a fine line. Have fun!