Introduction to the special issue honoring Suzanne MacDonald: Truly comparative and incomparable

I am honored to have been asked to curate and introduce this special issue recognizing the vast contributions of Dr. Suzanne MacDonald, professor of psychology at York University, Toronto Ontario, Canada, to the field of comparative psychology. As can readily be determined by only a cursory glance at the contents of this special issue, Suzanne's influence has been felt across disciplines as her work encompasses an impressive breadth of species, topics, and contexts. Suzanne is the true embodiment of a comparative psychologist. It is rare that one has impacted so many areas of study and amassed such diversity of experiences, even in a field defined by breadth and comparative analyses. This breadth is reflected in the contributions to this special issue, inspired by the special symposium organized by the Comparative Cognition Society to honor Suzanne at the annual conference in Albuquerque, New Mexico, USA in March of 2025. I am humbled not just by recognition of the quantity of Suzanne's contributions, both in terms of research and service to the field, but also because of the astounding practical significance of her contributions.