The other sampling technique used was a survey of animal signs, including systematic searches for fecal material, tracks, burrows and carcasses along the edge of each fragment. (sciencedaily.com)
Unfortunately, we are still dealing with the statistics of a very few number of impacts detected, but plans to improve our detection methods and perform systematic searches will help us to detect more of these objects. (sciencedaily.com)
Systematic searches of five databases were carried out. (link.springer.com)