Additional details: the outside part of the wing was brown with a blue/turquoise patch - dark streaks across the blue patch I think. I'm in Israel and there's a lot of migrating birds passing here. Never saw this bird before, but I'm no bird watcher.

Hmmm....I searched for a duck/goose with that round spot and found "Egyptian Goose". Try searching for that.

Might well be an Egyptian Goose. Thank you! I looked it up in my bird guide, which says it very raraly comes to Israel. Could it have strayed or got lost?

Still, the bird wasn't light brown but black and white mostly - the upper side of its body that is. Or was it cream coloured and not white? Very light cream - nearly white.

Looks like it might sort of be a pest in some areas. I have a feeling that so many of our animals/birds/plants that have been moved from their original places can easily become pests in new settings, and disrupt the native habitats. Look at the problem with pythons in Florida. Here's an article about the Egyptian Goose in the U.S.

https://birdsna.org/Species-Account/bna/species/egygoo/introduction

Thank you for the link to the article. Most likely it was an Egytian Goose. It was such an unexpected sight and quite moving for some reason. I didn't know you had pythons in Florida. I just checked on Wiki, which says Burmese pythons. Give me geese every day :)