This guide shows another location where the reptile in the last Dry Lands level can be found.
Finding the reptile in the third Dry Lands level of this game was one of the most difficult items to find for me personally. I have spent more than an hour searching for it, after which I considered looking up the solution online. However, multiple guides and websites all showed the same location where to find this item, but unfortunately I could not find the reptile in my game session at the pin pointed place.
Eventually I found it somewhere else, which I have indicated in Fig 1. below. Although it is still located in the cactus forest, one might have to look at the left section of the forest.
I hope this can help others who could not find it after their own efforts :)