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Thanks Ant, Chris, Tom, Ken and BC.
Good point about the salt blowing. Because they feed in sea water, the marine iguanas ingest/breath in (?) too much salt. They get rid of it on land by periodically "blowing their noses." It's fun to watch the twin sprays shooting out their nostrils, but it takes time and patience to photograph it. Although our tour was never rushed, I felt there were better things for me to do than wait 10 or 15 minutes for what may or may not be a good photo. So-alas- I have no pics (except in my memory ).
I was in the Galapagos about 30 years ago, and the only restrictions were: 1- don't touch any of the animals and 2- don't get so close that you affect their behavior. Our group of eight travelers all complied with no complaints, and our Ecuadorian guide knew he could trust us, so he didn't regiment us at all.
Once, I was sitting on a rock watching a baby sea lion that was waiting for his momma to return from fishing. The tiny tyke shuffled over to me and would have sniffed my leg, but I moved so that he couldn't. No big deal- I understood (and agreed with) the thinking behind such regulations.