Bird spikes work by eliminating the areas where these flying animals are landing. The spike strips act as a powerful deterrent and force pigeons, crows, seagulls, blackbirds and all other species to move on to a new place. Animals are not actually spiked and do not come into contact with it in any way. They simply provide an uninviting surface that humanely stops them from landing. Finding an effective pigeon deterrent is not always easy. But don't worry, these stainless steel bird spike kits are the best way to get rid of pigeons and all other feathered animals. They can be installed on a number of surfaces including roof peaks, gutters, ledges and any other surface where birds may land and nest. They are 100% effective on all surfaces and this particular brand has the most positive feedback from paying customers than any other pest control product I have been able to find. Tip: Stay away from the plastic model. They tend to wear down and break over time from exposure to the elements. Use the exact bird spikes in this video for best results. They are built much better and will withstand any harsh conditions. If properly installed, this product can last for decades. This model has a flexible base which leads to an easy installation on all surfaces and they are barely visible from the ground. I rate these bird spikes as the best repelling for eliminating birds from landing and nesting. A little bit of technical info on your foe: Birds are feathered, vertebrates with wings. They are well known for their feathers, beaks and the laying of eggs. There are over 10,000 different types of species and some have been around for 150 million years. Want more info.