I find it's best to mow, starting at a fairly High Point on sloped
land, and work your way down. The majority of creatures I'm dealing with are small snakes and frogs, particularly tree frogs. So I start in an area that is on a fairly steep slope above them, and work my way down. The
water feature and the
trees are downhill. I had my customers stand at the fence line, which is followed by a pond and even when I was 20 lawn mower widths away, the frogs and snakes began migrating out of the space.
We have determined that they migrate into the space fairly early in the day, because they
feed amongst the grass. Once their bellies are full, they will often return to the pond and trees on their own. So we changed over to cutting this area late in the afternoon and that way we're only dealing with a few stragglers. When I first discovered the tree frogs, I did a cut about 20 feet away from a row of trees and noticed dozens of them retreating in that direction. It was late morning and they were still feeding.
It's a cordless electric machine which doesn't make a huge amount of noise. But these creatures immediately sense the vibrations and foot traffic. About 1 acre of lawn and orchard, maintained for the cordless machine. I usually have three batteries charging at once.
I've done work on other properties, and it's usually pretty easy to determine where slow-moving types of animal would retreat to. The ones at risk, seem to be reptiles and amphibians. All of the mammals in my area are fleet of foot, and they take off immediately. The natural habitat for these reptiles and amphibians is almost always going to be a wetter area that is downslope. Sometimes snakes will be sunning themselves on higher rocky ground. They do this in the late morning where I live. Another good reason to do the cut in the afternoon, when they will have already migrated to their feeding areas which is closer to where you want to send them.
Start in an area where the grass is not too thick, that is opposite good natural habitat. Chances are, that this is where the animals sleep and breed. When they are found on a lawn, they are either feeding or they are in transit to somewhere different.