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
2020-10-11 08:52Arroyo de la Cruz1
2020-09-30 10:09Monterey Bay pelagic--inshore Monterey to Moss Landing (MTY Co.)1
2020-10-04 14:28Monterey Bay pelagic--inshore Monterey Harbor to Pt. Pinos (MTY Co.)23
2020-10-22 09:00Pt. Pinos--general (sea & shore Coral to Jewell, Crespi Pond & cypresses)2
2020-10-27 12:00Pt. Pinos--seawatch only1
2020-10-17 08:00Monterey Bay pelagic (SCZ Co., >2 mi offshore)45
2020-10-12 07:51Fort Mason Park1
2020-10-16 08:47Crissy Field Marsh8
2020-10-17 13:12Southeast Farallon Island--Nearshore Waters (less than 2 mi.) - including seabird colonies1
2020-10-24 07:00Southeast Farallon Island (restricted access)2
2020-10-05 09:51Dumas Bay Park1
2020-10-09 10:36Parsons Gardens Park1
2020-10-20 15:13Dash Point14
2020-10-04 15:20Don Armeni Boat Ramp1
2020-10-08 11:10Haines Wharf Park1
2020-10-27 09:40Luna Park1
2020-10-20 08:51Carkeek Park1
2020-10-12 07:4332nd Ave W Boat Launch, Magnolia1
2020-10-11 08:58Charles Richey Sr. Viewpoint4
2020-10-10 13:21Ruston Way--Dickman Mill Park1
2020-10-16 11:50Ocean Ave (Water St), Edmonds1
2020-10-19 08:24Alki (including north and south beaches)13
2020-10-16 08:13Richmond Beach Saltwater Park1
2020-10-19 07:05Magnolia Boulevard Park4
2020-10-14 08:07Seattle-Winslow Ferry (King Co.)1
2020-10-27 07:54Four Mile Rock, Magnolia11
2020-10-16 16:32Ruston Way--Judge Jack Tanner Park1
2020-10-25 14:37Golden Gardens Park1
2020-10-14 12:30Edmonds Waterfront2
2020-10-25 07:50Discovery Park5
2020-10-20 10:45Discovery Park--West Point3
2020-10-27 11:24Point Defiance Park--Dune Peninsula & Wilson Way13
2020-10-17 09:06Point Defiance-Tahlequah Ferry1
2020-10-12 17:19Point Defiance Park--Owen Beach1
2020-10-11 08:20Restoration Point (restricted access)2
2020-10-24 09:11Titlow Park & Beach1
2020-10-09 10:31Point Defiance Park--Dalco Passage Viewpoint1
2020-10-18 11:56Seattle-Winslow Ferry (Kitsap Co.)1
2020-10-22 10:33Point Defiance Park--Gig Harbor Viewpoint1
2020-10-16 10:41Edmonds-Kingston Ferry (Kitsap Co.)3
2020-10-25 09:19Chambers Bay Beach Access4
2020-10-20 12:26Bainbridge Island Ferry Terminal2
2020-10-27 07:45Fay Bainbridge Park2
2020-09-30 08:40Murden Cove & Estuary5
2020-10-25 16:16Point No Point1
2020-10-17 09:00Tacoma DeMolay Sandspit Nature Reserve, Fox Island1
2020-10-17 13:45Norwegian Point1
2020-10-14 07:10Billy Frank Jr. Nisqually NWR2
2020-10-17 07:31Luhr Beach3
2020-10-17 14:13Tolmie SP1
2020-10-20 12:02Upper Case Inlet--Victor Overlook1
2020-10-04 09:48Keystone Ferry Landing1
2020-10-11 18:03Port Townsend-Keystone Ferry (Island Co.)2
2020-10-05 08:50Indian Island County Park2
2020-10-17 12:46Boston Harbor Marina1
2020-10-26 08:55Rosario Beach / Rosario Head1
2020-10-25 14:49Guemes Channel Trail1
2020-10-12 09:42Point Hudson1
2020-09-30 16:22Point Wilson4
2020-10-15 12:15Washington Park, Anacortes1
2020-10-15 11:21Washington Park -- Green Point2
2020-10-22 12:50Port Townsend--Larry Scott Trail - boat haven end6
2020-10-10 15:50Point Arena-Stornetta Public Lands--south of LIghthouse Rd15
2020-10-16 07:18Point Arena Lighthouse- grounds and gate overlook ONLY2
2020-10-19 10:03Sandy Point1
2020-10-20 13:53Smith Island1
2020-10-23 11:22MacKerricher SP- Please use more precise location2
2020-10-19 12:58Gardiner Beach1
2020-10-18 10:28MacKerricher SP--Laguna Pt.1
2020-10-11 07:48Mendocino Headlands SP--bluffs1
2020-10-11 09:04MacKerricher SP--Glass Beach12
2020-10-25 09:15Anacortes to San Juan Islands ferry1
2020-10-18 17:00Cattle Point3
2020-10-27 12:00John Wayne Marina3
2020-10-05 13:01Sucia Island5
2020-10-08 15:50Marlyn Nelson County Park2
2020-10-06 17:13South Beach, San Juan Island10
2020-10-20 08:15Port Williams--Holland, Schmuck, John Scott Rds.4
2020-10-04 10:25Yellow Island3
2020-10-09 08:45Three Crabs4
2020-10-25 10:04Dungeness NWR1
2020-10-15 08:55Dungeness Recreation Area9
2020-10-27 11:15Trinidad Head1
2020-10-04 10:55Ten Mile Point--White Rock St and Baynes Rd2
2020-10-16 15:09Swartz Bay-Tswassen Ferry (WA water portion)2
2020-10-15 10:15Victoria--Cattle Point1
2020-10-20 07:30Victoria Golf Course (restricted access)3
2020-10-26 08:00Victoria--McMicking Point3
2020-10-23 08:51Victoria--Gonzales Bay1
2020-10-27 09:45Clover Point2
2020-10-14 08:06Ferry - Tsawwassen to Active Pass1
2020-10-04 12:27Beacon Hill Park6
2020-10-04 09:20Victoria--Dallas Road Waterfront Trail1
2020-10-12 13:31Cordova Bay1
2020-10-26 09:48Ediz Hook1
2020-10-15 15:17Island View Beach10
2020-10-19 11:50Siletz Bay--Salishan Nature Trail7
2020-10-11 09:29Yaquina River--SE Jetty Way1
2020-10-06 08:30Bayocean Spit1
2020-10-05 11:39Bazan Bay - Reay Creek mouth1
2020-10-04 16:54Newport pelagic--Yaquina Bay1
2020-10-15 09:27Siuslaw River--North Jetty2
2020-10-17 17:31Siuslaw River--South Jetty (jetty only)1
2020-10-12 07:49Siltcoos River Beach and Parking Area2
2020-09-29 14:58Moolack Beach1
2020-10-10 12:19Tillamook Bay--Barview Jetty4
2020-10-20 11:02Esquimalt Lagoon10
2020-10-05 10:32Yaquina River--South Jetty1
2020-10-24 07:40Boiler Bay State Wayside2
2020-10-04 16:16Newport pelagic--southwest route 0-5 miles offshore7
2020-10-02 13:03Umpqua River--South Jetty3
2020-10-14 15:10Witty's Lagoon Regional Park--Tower Point1
2020-09-30 09:44Pedder Bay mouth-Juan de Fuca Strait30
2020-10-25 14:25Race Rocks4
2020-10-06 10:24Elwha River mouth1
2020-10-05 16:10Metchosin--Sea Bluff Trail1
2020-10-18 06:55Rocky Point Bird Observatory (restricted access)3
2020-10-06 13:17Freshwater Bay2
2020-09-30 14:00East Sooke Park--Aylard Farm10
2020-10-02 12:30East Sooke Regional Park--Hawk Lookout1
2020-10-05 09:33Fort Stevens SP--South Jetty/Parking Area C1
2020-10-26 16:30East Sooke Regional Park--Beechey Head3
2020-10-03 17:05Salt Creek County Park2
2020-10-03 07:45East Sooke Regional Park6
2020-10-04 09:05Sooke--Whiffin Spit Park5
2020-10-09 07:38Cape Blanco SP1
2020-10-20 14:37Lyre Conservation Area1
2020-10-27 09:56Sooke--Otter Point9
2020-10-22 11:37Sheringham Point Lighthouse7
2020-10-24 12:03Griffiths-Priday State Park1
2020-10-22 12:56Jordan River9
2020-10-16 17:30Nanaimo--Neck Point Park1
2020-10-04 12:30Westport--Offshore waters15
2020-10-12 11:13Shipwreck Point3
2020-10-17 14:54Englishman River Estuary--Plummer Rd side1
2020-10-13 08:30French Creek mouth2
2020-10-17 12:21Columbia Beach2
2020-10-25 14:59Little Qualicum estuary1
2020-10-04 10:05Westport--offshore waters Grays Canyon6
2020-10-10 11:45Deep Bay1
2020-10-12 15:15Powell River-Little River ferry1
2020-10-10 11:49Copeland Islands2
2020-10-02 11:30Oyster Bay1
2020-10-01 09:47Campbell River - Quathiaski Cove ferry1
2020-10-26 10:11Ucluelet--Amphitrite Point6
2020-09-30 07:25Ucluelet--Big Beach1
2020-10-01 13:51Blackfish Sound, British Columbia13
2020-09-30 10:10Telegraph Cove2
2020-09-28 09:45Skidegate Landing to Alliford Bay ferry crossing1