the second one is definitely an anaconda... download it and play around with the contrast and you'll see its skin pattern.... that tail end is pointed, the last 7ft or so is also very thick for a 20 footer..it's almost a third too thick..but i cant see if it's attached to the tractor though
the black and white one could be a fake...i.e they've moved the tail end comming out of the water further away from you, if not, that is one huge snake..because the end of its tail is about 35ft away and at least 8ft of it is in the water.
the problem with this photo is, if the snake was that massive (46ft long); its head end would be much larger, the head looks too small compared to the grass...........most odd
uuum. is that head as wide as ours?..... if so it's a 46 footer... very hard to tell