Which author should Lavern cite for a definition of cryptozoology?

Heuvelmans is recognized as one of the founding figures in the field of cryptozoology. His work, particularly the book "On the Track of Unknown Animals," laid the groundwork for defining the discipline, which focuses on the study of and search for animals whose existence is not substantiated by mainstream science, such as Bigfoot or the Loch Ness Monster. By citing Heuvelmans, Lavern is aligning with an authoritative source that encapsulates the essence of cryptozoology and its foundational concepts.

In contrast, while Darwin’s theories are essential to understanding evolutionary biology, they do not specifically address cryptozoology. Jung’s contributions pertain more to psychology and mythology, which, while intersecting with cultural aspects of cryptids, do not provide a definition for the field. Hawking’s work focuses predominantly on theoretical physics and cosmology, lacking relevance to the subject of cryptozoology. Thus, Heuvelmans stands out as the most appropriate source for a definition in this specific area.