Cryptozoology scrutinizes reports of puzzling creatures that do not fit nicely into the recognized scheme of described species, such as long-tailed bobcats, giant orangutans, merfolk and sea monkeys and many more.
From the first chapter:
"What is Cryptozoology? In short, it is a targeted-search methodology for zoological discovery. Specifically, it is just one path by which the status of purported new or lost species may be resolved. Practically, it is a lengthy process of collecting and analyzing data to determine which mystery animals may be unknown biological species, and then searching for conclusive physical evidence."