We have them around our house and there always seems to be one inhabiting our screened in porch. It was interesting to watch, but the brown anoles did not appear in our area until about 5 years after we built our house. When they did, I was afraid the greens would disappear. However, after lots of observation, I have noted that the browns mostly stay on the ground, while the greens are largely arboreal. The greens really like small spiders, which makes it nice having them on our screened porch. In the 15 years since the browns moved in, I have not seen any noticeable changes in the green anole population. One other thing to note, however, is that the population density of greens is much lower than browns. In other words, when browns move in, they seem to be everywhere, whereas there might only be one green for every 20 browns in a given habitat. Perhaps that's why people perceive a decrease in the population of green anoles when brown anoles move into an area.

Both make great pets.