Although the correct phrase is "spring alters the blood", in photo trapping it could well be said that it is the photos that can be altered. We mean that a camera that has been successfully set up in a certain place all winter, taking photos regularly, may stop working properly when spring arrives.
Rainfall can cause weeds and vegetation to grow so thick that they can obstruct the camera's field of view and reduce the effectiveness of the motion sensor.
In this series of photos we can see a location of a Spartan S128 camera, with internet sending function, which has been sending us photos since February (the photos that we have put here have less resolution, for being the version that sends the camera).
For the last twenty days the vegetation has grown so much that it has become increasingly difficult to see the animals.
We'll have to get closer to mow the grass!