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
2020-07-25 08:00Pt. Dume1
2020-07-21 18:14Santa Maria River Estuary (SBA Co.)1
2020-07-29 15:07Salinas River mouth (access now restricted)1
2020-07-26 10:04Pt. Pinos--seawatch only1
2020-07-23 09:56West Cliff Dr. at Woodrow Ave.1
2020-07-26 18:15Terrace Pt. / Long Marine Lab1
2020-07-18 07:51Wilder Ranch SP--Old Cove Landing Trail1
2020-08-02 14:05Pescadero SB--west of Hwy 1 only1
2020-07-26 14:50Farallon Islands pelagic (SF Co.)2
2020-07-26 14:00Southeast Farallon Island--Nearshore Waters (less than 2 mi.) - including seabird colonies4
2020-08-02 07:00Southeast Farallon Island (restricted access)1000
2020-07-25 11:00Bodega Head - offshore species and the bluff ONLY1
2020-07-25 07:54Bodega Bay pelagic--nearshore (SON Co.)1
2020-07-06 16:33Seahurst Park1
2020-07-30 09:46Russian Gulch1
2020-07-08 08:00Tulalip Bay3
2020-07-07 14:54Don Armeni Boat Ramp1
2020-08-01 07:20Carkeek Park
2020-08-02 13:35Charles Richey Sr. Viewpoint1
2020-07-08 15:54Ocean Ave (Water St), Edmonds7
2020-07-27 06:45Alki (including north and south beaches)3
2020-08-01 06:20Richmond Beach Saltwater Park5
2020-08-01 11:27Four Mile Rock, Magnolia2
2020-07-31 05:28Golden Gardens Park17
2020-07-22 06:08Richmond Beach--Kayu Kayu Ac Park24
2020-07-14 14:10Edmonds Waterfront8
2020-08-03 07:24Discovery Park2
2020-07-27 06:37Discovery Park--West Point1
2020-08-01 10:24Point Defiance Park--Dune Peninsula & Wilson Way3
2020-07-06 07:00Blakely Rocks2
2020-07-30 09:32Chambers Bay Beach Access1
2020-08-01 06:48Murden Cove & Estuary2
2020-07-18 05:41Deer Lagoon1
2020-08-01 18:40Point No Point2
2020-07-23 17:13Norwegian Point6
2020-07-25 09:50Point Julia (restricted access)2
2020-07-15 09:39Driftwood Key1
2020-07-28 08:03Nature Conservancy Foulweather Bluff Preserve1
2020-07-18 08:15Foulweather Bluff20
2020-07-30 18:29Bywater Bay Spit & Tidelands1
2020-07-25 10:06Samish Island2
2020-08-02 11:20Admiralty Bay1
2020-07-17 13:20Keystone Ferry Landing1
2020-07-27 06:36Port Townsend-Keystone Ferry (Island Co.)24
2020-08-01 11:16Fort Flagler SP -- Marrowstone Point2
2020-07-15 15:40Fort Casey State Park5
2020-07-12 12:45Lagoon Trail Park1
2020-07-23 10:55Deception Pass SP -- Cranberry Lake25
2020-08-02 14:30Fort Flagler SP - Campground/Beach11
2020-07-31 11:45Port Townsend-Keystone Ferry (Jefferson Co.)300
2020-07-16 09:10Deception Pass SP -- West Beach75
2020-07-27 17:31Rosario Beach / Rosario Head2
2020-08-01 09:35Point Hudson2
2020-07-16 11:35Joseph Whidbey SP8
2020-07-29 07:35Chimacum Creek3
2020-07-20 08:43Anacortes Ferry Terminal52
2020-07-18 06:25Port Townsend ferry terminal14
2020-08-01 09:06Point Wilson10
2020-07-10 09:02Port Townsend Marine Science Center1
2020-07-31 11:01Washington Park, Anacortes2
2020-08-02 10:10Fort Worden SP30
2020-07-17 10:19Deepwater Bay25
2020-07-18 16:15Washington Park -- Green Point15
2020-08-02 09:04Ebey's Landing NHP--Fort Ebey--Gun Battery15
2020-07-07 11:00Sinclair Island45
2020-07-20 16:48Rosario Strait (Skagit Co.)15
2020-07-09 10:41Burrows Island Marine State Park11
2020-07-30 10:45Port Townsend -- North Beach20
2020-08-03 06:08Libbey Beach County Park14
2020-07-24 16:46Sandy Point1
2020-08-02 14:15Rosario Strait (San Juan Co. side)9
2020-07-17 13:03Minor Island5
2020-07-17 13:02Smith Island2
2020-08-01 20:44Gardiner Beach1
2020-07-16 11:43Mendocino Headlands SP--bluffs3
2020-07-24 05:50Diamond Point38
2020-07-20 16:50Todd Point/Pomo Bluffs Park1
2020-07-05 12:32Pt. Cabrillo Light Station State Historic Park1
2020-07-21 13:00Protection Island200
2020-07-26 14:06Anacortes to San Juan Islands ferry12
2020-07-26 18:15Birch Bay1
2020-07-26 11:03Semiahmoo Spit1
2020-08-02 12:12Cattle Point8
2020-07-23 19:48John Wayne Marina39
2020-07-27 13:29Brandt's Landing Marina, Orcas Island2
2020-07-07 08:57Gibson Spit750
2020-07-18 08:00Marlyn Nelson County Park40
2020-07-08 15:30Orcas Ferry Landing2
2020-07-19 16:45Maple View Farm2
2020-07-11 15:45San Juan Island--Turn Point County Park6
2020-07-18 06:15Jamestown Beach20
2020-07-28 19:37Patos Island2
2020-07-22 08:54Jackson Beach30
2020-07-30 12:14Three Crabs3
2020-07-11 06:56Dungeness NWR500
2020-08-01 08:15Dungeness Spit--Strait of Juan de Fuca side400
2020-07-20 09:00Dungeness NWR--forest trails20
2020-08-02 06:05Dungeness Recreation Area150
2020-07-14 16:38Westside Scenic Preserve1
2020-07-24 19:52San Juan County Park1
2020-07-24 08:16Sculpture Park7
2020-07-05 11:00Trinidad SB--Elk Head2
2020-07-17 14:25Patricks Point SP--Wedding Rock4
2020-07-30 13:01Ten Mile Point--White Rock St and Baynes Rd2
2020-07-15 07:58Victoria--Cattle Point2
2020-08-02 17:37Victoria--McMicking Point49
2020-08-01 07:37Kitty Islet72
2020-07-30 09:00Humboldt Bay--entrance channel1
2020-07-18 08:15Victoria--Harling Point (Chinese Cemetery)13
2020-07-27 16:00Crescent City Harbor3
2020-08-01 10:30Humboldt Bay--North Spit jetty2
2020-08-01 11:37Crescent City Harbor--B Street pier1
2020-07-19 07:00Mandarte Island5
2020-07-26 16:45Crescent City Harbor--Battery Point Lighthouse1
2020-08-02 07:41Clover Point
2020-07-23 08:39Beacon Hill Park2
2020-07-17 13:59Port Angeles City Pier211
2020-07-24 12:02Sidney Spit--Lagoon100
2020-07-18 10:00Cordova Bay14
2020-08-02 09:18Sidney Spit (Gulf Islands National Park Reserve)3
2020-07-14 09:09Victoria--Ogden Point Breakwater1
2020-08-02 13:15Ediz Hook5
2020-07-29 10:01Island View Beach3
2020-07-23 15:26Sidney Island Ferry1
2020-07-26 08:45Saanichton Spit (TIXEN) (Access restricted during COVID)3
2020-07-27 15:42Esquimalt--Macaulay Point5
2020-07-26 07:00Mattole River mouth2
2020-07-10 09:07James Island Pier3
2020-07-30 10:27Tillamook Bay--Garibaldi Public Pier5
2020-08-02 11:49Mark Hatfield Marine Science Center and Estuary Trail1
2020-07-31 15:28Barview Tide Pool3
2020-07-29 10:06Siuslaw River--North Jetty-Mudflats2
2020-07-28 06:35D River Beach Wayside2
2020-07-29 13:00Yaquina River--SE Jetty Way1
2020-07-06 09:21Ruckle Park, Saltspring Island5
2020-07-09 08:21Sidney--Lochside Drive waterfront7
2020-07-17 19:16Painted Rock2
2020-07-30 14:29Siuslaw River--South Jetty (general)11
2020-07-09 12:30Bayocean Spit7
2020-07-31 13:51Bazan Bay - Reay Creek mouth12
2020-07-31 14:55Siuslaw River--South Jetty-Parking Lot #23
2020-07-09 11:58Sutton Beach5
2020-07-30 13:15Tokatee Klootchman SP1
2020-07-25 08:08Yachats River mouth1
2020-08-02 06:22Siuslaw River--North Jetty6
2020-07-29 12:50Siuslaw River--South Jetty (jetty only)2
2020-07-28 07:00Heceta Beach6
2020-07-29 11:00Sea Lion Pt. & Overlook1
2020-07-22 07:00Strawberry Hill3
2020-07-11 11:06Bob Creek Wayside2
2020-07-10 08:20Siltcoos River Beach and Parking Area4
2020-07-27 12:15Yachats SP4
2020-07-31 16:35Tillamook Bay--Barview Jetty4
2020-07-22 16:50Yachats--804 Trail/Ocean View Dr. (south of Adobe to Yachats SP)1
2020-08-03 10:00Esquimalt Lagoon5
2020-07-30 09:39Rockaway Beach2
2020-07-29 13:20Yaquina River--South Jetty1
2020-07-20 09:19Harris Beach SP3
2020-07-24 06:45Nehalem Bay SP3
2020-07-09 13:35Manzanita1
2020-07-31 13:01Devils Punchbowl SP2
2020-07-10 19:00Manzanita Beach1
2020-07-10 15:13Boiler Bay State Wayside1
2020-07-29 14:31Rodea Point1
2020-07-19 14:06Newport pelagic--southwest route 0-5 miles offshore1
2020-07-19 07:45Pedder Bay mouth-Juan de Fuca Strait42
2020-07-20 15:50Race Rocks7
2020-07-19 06:23Seaside Cove1
2020-07-30 08:50Elwha River mouth50
2020-07-30 12:01Elwha River Mouth -- west access3
2020-07-22 13:35Silver Point4
2020-07-18 12:05Cannon Beach1
2020-07-12 08:53Sunset Beach Recreation Area12
2020-08-02 08:30Rocky Point Bird Observatory (restricted access)2
2020-07-29 09:20Metchosin--Weir's Beach2
2020-07-09 09:45Empire Boat Ramp1
2020-07-10 10:32Fort Stevens SP--Wreck of the Peter Iredale22
2020-08-01 11:00Fort Stevens SP3
2020-07-11 11:38Fort Stevens SP--South Jetty/Parking Area C6
2020-07-31 07:35East Sooke Regional Park--Beechey Head7
2020-07-24 09:29Cape Arago SP1
2020-07-11 08:03East Sooke Regional Park1
2020-07-14 19:03Lyre Conservation Area1
2020-07-23 12:45Warrenton Cannery Road3
2020-07-22 16:40Grayland Beach State Park80
2020-07-11 12:05Grayland Beach1
2020-08-02 08:35Sooke--Otter Point1
2020-07-25 18:24Westport -- Marina20
2020-07-22 11:34Westport (general)150
2020-07-20 13:04Westhaven SP67
2020-07-29 10:38Ocean Shores--Damon Point14
2020-07-11 09:58Westport Jetty80
2020-08-02 13:05Ocean Shores--Oyhut Wildlife Area2
2020-08-01 15:40Ocean Shores STP2
2020-08-01Ocean Shores1
2020-08-01 14:05Ocean Shores--Pt. Brown Jetty45
2020-07-22 14:38Westport pelagic--inshore130
2020-07-10 08:10Ocean City2
2020-07-25 13:01Griffiths-Priday State Park1
2020-07-11 09:45Jordan River28
2020-07-24 08:06Olympic NP--Kalaloch1
2020-07-22 11:28Westport--Offshore waters16
2020-07-28 11:40Sekiu2
2020-07-31 14:40Olympic NP--Destruction Island Overlook40
2020-07-08 15:00Bridgemans Marina1
2020-07-31 11:48Olympic NP--Rialto Beach4
2020-07-11 09:10Westport--offshore waters Grays Canyon2
2020-07-22 09:45Westport pelagic--offshore (west) of Grays Canyon1
2020-07-21 10:50Oyster Bay8
2020-07-07 20:40Ucluelet--Amphitrite Point1
2020-07-15 09:45Ucluelet Pelagic--Inshore Pelagic Waters2
2020-07-17 12:30Pacific Rim National Park--Wickaninnish Beach1
2020-07-18 13:00Barkley Canyon10
2020-07-17 08:35Cleland Island35
2020-07-13 05:31Sayward--Salmon River estuary mudflats3
2020-07-11 13:59Malcolm Island--Kaleva Road9
2020-07-22 08:00Cluxewe Estuary2
2020-07-31 12:14Queen Charlotte Strait25
2020-07-29 07:06Digby Island--Dodge Cove2
2020-07-12 13:20Prince Rupert--Digby Island124
2020-07-12 13:20Prince Rupert--Venn Passage124
2020-07-23 18:17Haida Gwaii - Kuuna11
2020-07-13 11:54Prince of Wales Is.--Craig1
2020-07-23 13:09Sitka Sound326
2020-07-27 11:46Middleton Island (restricted)--Sea Lion point35
2020-07-30 13:45Middleton Island (restricted) (Gulf of Alaska)80
2020-07-08 08:27Chiswell Islands (S of Aialik Bay-Gulf of Alaska)1
2020-07-26 12:25Anchor Point1
2020-07-22 16:23八戸〜苫小牧フェリー--三沢空港正面 (Hachinohe~Tomakomai Ferry--Off Misawa)1
2020-07-22 11:52八戸〜苫小牧フェリー--鹿部正面 (Hachinohe~Tomakomai Ferry--Off Shikabe)1
2020-07-23 09:00苫小牧〜八戸フェリー (青森県) (Tomakomai~Hachinohe ferry (Aomori Prefecture)1
2020-07-24 04:30苫小牧〜大洗フェリー(青森県)Tomakomai~Oarai ferry (Aomori Prefecture)1
2020-07-08 14:08稚内市--こうほねの家 (Wakkanai--Kohone Rest House/Observation Deck)7
2020-07-10 05:29苫小牧市--沖 (Tomokomai--offshore)1