Nests and Van Gogh

I've had the chance to see Van Gogh's special exhibit at the Art Institute of Chicago twice already.  I love it.  It is a great insight into the artist and his work, especially focusing on the three bedroom paintings.  One thing I learned from the exhibit is that Van Gogh did a lot of drawings and paintings of birds nests.  An interesting concept for him to be painting since he lived in 37 different places in his 37 years of life.  I'm that age and I can't imagine moving that much!  I've only lived in three places.  He used to pay kids to collect nests for him to study.  Have you ever really looked at a nest?   They are very difficult to paint and draw.