Nuclear star cluster mass vs galaxy mass for our sample. The different colours and symbols refer to the identified dominant NSC formation channel. We differentiate between dominated by central in situ star formation either directly at the NSC or in central star clusters that were rapidly accreted as determined from high metallicities or young ages (orange), formation through GC accretion as evident from central declines in metallicity (purple), and galaxies in which both channels are required to explain the NSC properties (green). Included are KKs 58 and KK 197, two nucleated dwarf galaxies with NSCs formed through GC accretion (Fahrion et al. 2020a). The dashed lines indicate the transition NSC and galaxy masses where the dominant channel changes.