The rhinoceros auklet (Cerorhinca monocerata) is a seabird and a close relative of the puffins. It is the only living species of the genus Cerorhinca. Given its close relationship with the puffins, the common name rhinoceros puffin has been proposed for the species.

It ranges widely across the North Pacific, feeding on small fish and nesting in seabird colonies. Its name is derived from a horn-like extension of the beak. This horn is only present in breeding adults, and like the elaborate sheath on the bill of puffins is shed every year.

The rhinoceros auklet (also known as the rhino auklet, horn-billed puffin, or unicorn puffin), is a medium-sized auk with a large, strong, orange/brown bill (with the 'horn' protruding from it). The plumage is dark on top and paler below; breeding adults (both male and female) possess white plumes above the eyes and behind the bill. Males are slightly larger than females (about 10% in mass).
Rhinoceros Auklet
Date Location Count
2021-11-27 07:34Off Pt. Loma (offshore species only)2
2021-11-27 11:45Off La Jolla (offshore species only)3
2021-11-27 07:34Lower Nine Mile Bank (SD Co.)2
2021-11-27 12:57Upper Nine Mile Bank (SD Co.)1
2021-11-20 07:30Crespi Knoll (ORA Co.)6
2021-11-17Santa Barbara Channel--east channel (VEN Co.)1
2021-11-23 09:49Santa Barbara Channel, Channel Islands National Park2
2021-11-13 16:05Santa Barbara Channel--east channel (SBA Co.)3
2021-11-07 13:00Santa Cruz Island--Prisoners Harbor
2021-11-07 06:51Point Conception Lighthouse (restricted access)3
2021-11-29 09:22Estero Bay pelagic--nearshore waters (SLO Co.)5
2021-12-04 08:00Moss Landing--marina, town & beach (south jetty southwards)5
2021-11-26 09:51Monterey Bay pelagic--nearshore Moss Landing (<5 mi off MTY Co.)25
2021-11-27 10:00Monterey Bay pelagic--inshore Monterey to Moss Landing (MTY Co.)4
2021-11-20 08:00Pacific Grove--Lovers Pt.1
2021-11-23 09:51Pt. Pinos--general (sea & shore Coral to Jewell, Crespi Pond & cypresses)11
2021-12-05 09:00Pt. Pinos--seawatch only3
2021-11-15 09:08Pt. Lobos State Reserve2
2021-11-28 12:25Monterey Bay pelagic (SCZ Co., >2 mi offshore)50
2021-11-28 12:15Monterey Bay pelagic—inshore Terrace Pt. to Soquel Pt. (<2 mi offshore)1
2021-11-25 08:19Lighthouse Pt.115
2021-11-14 06:40West Cliff Dr.--western (Lighthouse Pt. to Swanton Blvd.)330
2021-11-15 11:41Terrace Pt. / Long Marine Lab1
2021-11-06 09:01Wilder Ranch SP--Ohlone Bluff Trail and ag fields6
2021-11-14 09:24Laguna Beach12
2021-11-16 07:57Pigeon Pt.1
2021-11-20 07:50Cliff House2
2021-11-06 13:45Pt. Reyes--Pt. Reyes Beach South1
2021-12-05 07:00Southeast Farallon Island (Farallon Islands NWR, restricted access)1
2021-11-24 10:37Bodega Head - offshore species and the bluff ONLY5
2021-11-09 07:12Redondo Pier1
2021-12-03 08:56Zenith5
2021-11-06 09:10Bodega Bay pelagic--nearshore (SON Co.)5
2021-12-04 14:02Des Moines Marina1
2021-11-21 12:04Point Robinson3
2021-11-12 11:40Olympic Sculpture Park1
2021-11-26 14:21Elliott Bay Trail, Seattle2
2021-11-30 11:19Dash Point SP (King Co.)3
2021-11-22 10:32Mukilteo Ferry Terminal5
2021-11-28 10:42Jack Block Park5
2021-12-05 10:59Myrtle Edwards Park / Centennial Park1
2021-11-29 11:50Mukilteo Lighthouse Park4
2021-11-29 10:15Dash Point1
2021-11-23 13:21Thea's Park2
2021-12-04 11:47Seacrest Park6
2021-11-16 07:12Meadowdale County Park2
2021-12-04 10:48Luna Park3
2021-12-04 10:12Browns Pt. Lighthouse Park2
2021-12-02 13:00Browns Pt. Lighthouse Park3
2021-12-04 11:19Alki Beach3
2021-12-03 07:45Carkeek Park15
2021-12-04 12:49Me-Kwa-Mooks Park2
2021-11-13 09:31Charles Richey Sr. Viewpoint5
2021-11-29 14:16Ruston Way--Dickman Mill Park1
2021-12-02 10:20Ocean Ave (Water St), Edmonds1
2021-11-21 11:20Fauntleroy-Vashon Island Ferry7
2021-12-05 07:42Alki (including north and south beaches)1
2021-12-04 09:00Richmond Beach Saltwater Park2
2021-11-17 06:58Sunset Hill Park6
2021-11-23 15:57Seattle-Winslow Ferry (King Co.)1
2021-11-15 08:53Point Shilshole Beach1
2021-12-05 09:37Golden Gardens Park18
2021-12-05 13:50Edmonds Waterfront1
2021-11-23 15:25Manzanita Beach2
2021-12-05 11:32Discovery Park3
2021-12-05 08:45Seattle-Bremerton Ferry4
2021-12-05 10:02Discovery Park--West Point18
2021-12-05 08:20Point Defiance Park--Dune Peninsula & Wilson Way2
2021-12-02 11:16Edmonds-Kingston Ferry (Snohomish Co.)1
2021-12-05 11:50Point Defiance Park2
2021-12-02 07:28Restoration Point (restricted access)38
2021-11-29 10:24Titlow Park & Beach4
2021-11-19 11:02Point Defiance Park--Dalco Passage Viewpoint35
2021-11-26 08:47Seattle-Winslow Ferry (Kitsap Co.)12
2021-12-03 09:54Point Defiance Park--Gig Harbor Viewpoint14
2021-11-23 08:41Chambers Bay Beach Access1
2021-12-02 14:04Sunrise Beach County Park8
2021-11-26 14:23Sunnyside Beach Park2
2021-11-26 08:25Fox Island Public Fishing Pier7
2021-11-18 07:57Kingston Ferry Terminal6
2021-11-11 10:13Manchester State Park4
2021-11-26 14:06Iverson Point1
2021-11-10 11:24Suquamish1
2021-12-05 07:35Point No Point1
2021-12-01 12:40Norwegian Point2
2021-11-20 11:00Billy Frank Jr. Nisqually NWR2
2021-11-18 13:51Point Julia (restricted access)1
2021-11-21 12:45Utsalady Point1
2021-12-05 12:31Luhr Beach3
2021-11-18 10:46Salsbury Point Park1
2021-11-20 15:05Nature Conservancy Foulweather Bluff Preserve3
2021-11-19 12:50Shine Tidelands6
2021-12-05 10:13Tolmie SP3
2021-12-05 10:40Whidbey Island -- Bush Point10
2021-11-13 11:07Woodard Bay Preserve1
2021-12-03 12:57Keystone Ferry Landing1
2021-11-13 09:30Allyn Waterfront Park2
2021-11-26 15:17McMicken Island Marine SP9
2021-12-05 13:03Olympia--KGY Point1
2021-11-06 10:40Fort Flagler SP1
2021-12-01 13:00Olympia--West Bay Park5
2021-12-04 13:58Burfoot Park4
2021-11-27 12:51Fort Flagler SP - Campground/Beach3
2021-11-19 08:31Boston Harbor Marina18
2021-12-02 10:05Port Townsend-Keystone Ferry (Jefferson Co.)
2021-11-29 11:05Deception Pass SP -- West Beach1
2021-11-29 13:12Rosario Beach / Rosario Head5
2021-12-05 10:00Point Hudson1
2021-12-04 12:00Chimacum Creek1
2021-12-05 11:50Point Wilson1
2021-12-04 14:20Washington Park, Anacortes1
2021-11-29 12:40Fort Worden SP1
2021-11-18 11:36Williamson Rocks2
2021-11-30 11:46Washington Park -- Green Point2
2021-11-23 11:13Libbey Beach County Park1
2021-12-05 13:12Sandy Point4
2021-11-26 15:10Smith Island2
2021-11-28 08:45Gardiner Beach1
2021-11-19 11:30Mendocino Headlands SP--bluffs3
2021-11-17 08:34Mendocino Coast Botanical Gardens1
2021-11-29 09:39San Juan Islands ferry8
2021-11-16 14:50Cattle Point6
2021-12-04 12:34John Wayne Marina4
2021-12-01 16:20Marlyn Nelson County Park1
2021-11-11 07:42Jamestown Beach1
2021-11-10 12:27Eagle Cove, San Juan Island2
2021-12-05 12:28Friday Harbor Labs1
2021-11-22 13:25False Bay4
2021-11-20 12:38Rueben Tarte County Park1
2021-11-19 15:05Lime Kiln Pt. SP1
2021-12-05 12:09Point Roberts jetties9
2021-12-05 10:00San Juan County Park2
2021-11-12 09:00Trinidad SB--Elk Head2
2021-11-26 10:27South Pender Island--Brooks Point Park2
2021-11-15 09:56Sue-Meg State Park--Wedding Rock3
2021-11-26 13:45Oak Bay--Cattle Point1
2021-11-20 09:50Victoria--McMicking Point1
2021-12-02 12:45Oak Bay--Turkey Head/Queen's Park1
2021-11-12 09:52Oak Bay--Bowker Avenue1
2021-12-02 12:25Victoria--Glencoe Cove Park3
2021-11-12 11:40Victoria--Harling Point (including Chinese Cemetery)2
2021-11-16 13:00Crescent City Harbor--Battery Point Lighthouse & Jetty1
2021-12-02 08:00Clover Point1
2021-11-06 13:00Victoria-Port Angeles, Canadian side16
2021-11-16 13:40Cordova Bay1
2021-12-02Victoria--Fisherman's Wharf1
2021-12-02 11:00Victoria--Ogden Point Breakwater1
2021-11-20 10:10Pender Island - Thieves Bay1
2021-11-07 11:05Point St. George--seawatch only2
2021-11-24 08:25Ediz Hook2
2021-11-15 13:00Island View Beach2
2021-11-18 09:32Esquimalt--Macaulay Point2
2021-11-19 13:53Ferry - Swartz Bay to Active Pass3
2021-11-22 11:05Barview Tide Pool1
2021-12-03 14:01Ruckle Park, Saltspring Island1
2021-11-28 07:55Tokatee Klootchman SP3
2021-11-11 09:00Bray Pt.1
2021-11-26 14:30Siuslaw River--North Jetty1
2021-11-16 11:39Tillamook Bay--Barview Jetty1
2021-11-20 10:55Esquimalt Lagoon1
2021-12-04 10:46Yaquina Head Outstanding Natural Area--Lighthouse1
2021-12-04 10:25Boiler Bay State Wayside1
2021-11-15 13:42Witty's Lagoon Regional Park--Tower Point2
2021-11-28 15:45Race Rocks1
2021-11-07 10:05Seaside Cove1
2021-11-20 08:32Silver Point2
2021-11-17 11:48East Sooke Park--Aylard Farm1
2021-11-21 08:41Bowen Island--Tunstall Bay1
2021-11-13 11:20Bowen Island--Cape Roger Curtis Lighthouse1
2021-12-05 08:35East Sooke Regional Park--Beechey Head3
2021-11-13 10:11Salt Creek County Park3
2021-11-19 07:45Cape Arago SP7
2021-11-13 10:04East Sooke Regional Park4
2021-11-20 10:40Cape Disappointment SP--North Head14
2021-11-19 13:40Sooke--Whiffin Spit Park1
2021-11-23 08:51Sooke--Otter Point2
2021-11-10 09:41Westhaven SP1
2021-11-13 08:50Roberts Creek Jetty1
2021-11-15 11:01Ocean Shores--Pt. Brown Jetty1
2021-11-20 15:12Sheringham Point Lighthouse2
2021-11-09 16:37Pillar Point Recreation Area1
2021-11-12 10:39Nanaimo--Neck Point Park2
2021-12-01 14:13Oakleaf Regional Park1
2021-11-13 08:35Nanoose Bay--Cottam Point2
2021-11-12 11:54French Creek mouth3
2021-11-10 12:21Neah Bay--The Wedge8
2021-11-10 10:49Columbia Beach1
2021-11-06 09:40Hornby Island--Helliwell Park2
2021-11-16 10:52Deep Bay1
2021-11-13 09:55Old Secret Beach campground/Toquart Bay access6
2021-11-13 09:10Maggie River estuary1
2021-11-14 09:46Ucluelet, Helen Road2
2021-11-21 09:20Ucluelet--harbour1
2021-11-23 11:57Ucluelet1
2021-12-05 11:51Ucluelet Boat Launch1
2021-11-17 09:49Pacific Rim National Park--Wickaninnish Beach1
2021-11-09 14:29Haida Gwaii--Skidegate Inlet BC IBA1451