  We extend ultragraph shift spaces and the realization of ultragraph
C*-algebras as partial crossed products to include ultragraphs with sinks
(under a mild condition, called (RFUM2), which allow us to dismiss the use of
filters) and we describe the associated transformation groupoid. Using these
characterizations we study continuous orbit equivalence of ultragraph shift
spaces (via groupoids) and KMS and ground states (via partial crossed
products).
