Waldo is a genus of small marine clams in the family Galeommatidae. It includes five species which are all obligate commensals of sea urchins.

Where's Waldo? Sensor-Based Temporal Logic Motion Planning
Where's Waldo? Sensor-Based Temporal Logic Motion Planning
Finding Waldo, or Focus of Attention Using Local Color Information
Finding Waldo, or Focus of Attention Using Local Color Information
The Administrative State: A Study of the Political Theory of American Public Administration by Dwight Waldo
Finding Waldo, or Focus of Attention Using Local Color Information
Where's Waldo Now?: Deluxe Edition
Ralph Waldo Emerson and "self Reliance"
Revisions of the Treaty of Versailles. By Waldo E. Stephens. (New York: Columbia University Press. 1939...
Effect of d-sotalol on mortality in patients with left ventricular dysfunction after recent and remote myocardial infarction. The SW...