The first picture and the one of the tree definitely look like Holga images - since the article is on a Holga site, I'm guessing most of them might be. The characteristic 'fuzzy' bokeh in those pictures gives it away more than the vignetting - look at the sand in the elephant picture and the wall in the tree image. The picture of the bird may well be Holga too, but only the bottom edges look burned in. So Holga + burning.