Required for cell migration and engulfment of cell corpses but not for programmed cell death/apoptosis (PubMed:10707082, PubMed:6857247, PubMed:1936965, PubMed:11449278, PubMed:15744306, PubMed:19402756, PubMed:20226672). Has a role in the migration of the 2 gonadal distal tip cells (DTCs) (PubMed:10707082). Plays a role in protecting dopaminergic neurons from oxidative stress-induced degeneration (PubMed:29346382). Interacts with ced-5 (via C-terminus which contains a candidate SH3-binding, proline-rich region) (PubMed:10707082, PubMed:11703940, PubMed:21616056). Forms a ternary complex with ced-5 and ced-12 (PubMed:11703940). Interacts (via SH2 domain) with src-1 (when activated and phosphorylated at 'Tyr-416') (PubMed:20226672). Dead cells/corpses fail to be engulfed. Defective in the migration of distal tip cells and gonad development. Actin halos are absent. Belongs to the CRK family.