An inexpensive “smart” trap to capture nestbox-breeding owls and reduce sex biases in ringing data
The ringing and controlling of previously marked birds are invaluable tools for studying the survival, productivity, and movement of birds. To maximize the value of ringing data, it is important to minimize any potential biases. For some species, such as nestbox-breeding owls, ringing records are typically heavily skewed toward females because they generally are easier to catch. The use of traditi
