This video from the USA says about itself:
The marbled murrelet (Brachyramphus marmoratus) is a small Pacific seabird listed as threatened under the Endangered Species Act in California, Oregon and Washington. Rarely seen by humans, they spend the majority of their lives at sea forage, rest, and mate.
For years, ornithologists did not know where this mysterious bird nested. It wasn’t until 1974 that the first marbled murrelet nest was discovered in North America. Generally, they nest in coastal old-growth forests, characterized by large trees with multiple canopy layers and moderate to high canopy closure. For more information, on this unique and threatened Pacific Northwest seabird, please visit the following USFWS websites: