Enables Notch binding activity. Involved in clathrin-dependent endocytosis and positive regulation of Notch signaling pathway. Predicted to be located in several cellular components, including adherens junction; apical plasma membrane; and membrane raft. Predicted to be active in plasma membrane. Orthologous to human DLL1 (delta like canonical Notch ligand 1). [provided by Alliance of Genome Resources, Apr 2022]