Marbled murrelet are semicolonial in nesting habits. Marbled murrelets lay only one egg. The egg is incubated by both parents for about 30 days.
Adults fly from ocean feeding areas to inland nest sites, mostly at dusk and dawn.
They feed nestlings at least once and sometimes twice per day or night. Fledging - Nestlings fledge in 28 days. Migration - Some marbled murrelet populations probably migrate south in fall and north in spring. Many marbled murrelets regularly visit coastal lakes. Stand size is also important in nest sites.