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
2021-03-28 10:50Prisoner's and Scorpion's harbors transfer (inshore)1
2021-03-26 10:00Monterey Bay pelagic--nearshore Moss Landing (<5 mi off MTY Co.)2
2021-04-02 09:51Pt. Pinos--general (sea & shore Coral to Jewell, Crespi Pond & cypresses)2
2021-03-24 07:56Pt. Pinos--seawatch only4
2021-04-04 08:15Monterey Bay pelagic (SCZ Co., >2 mi offshore)3
2021-04-12 11:35Natural Bridges SB1
2021-03-28 10:30Monterey Bay pelagic (MTY Co.)2
2021-03-29 08:50El Jarro Pt.1
2021-03-25 07:26Pigeon Pt.1
2021-03-30 14:15Half Moon Bay--inshore bay2
2021-04-04 12:04Southeast Farallon Island (Farallon Islands NWR)--Nearshore Waters (less than 2 mi.) - including seabird colonies5
2021-04-17 08:19Southeast Farallon Island (Farallon Islands NWR, restricted access)4
2021-04-16 09:01Bodega Head - offshore species and the bluff ONLY1
2021-04-16 08:03Dumas Bay Park1
2021-04-13 07:20Carkeek Park1
2021-04-09 08:59Ocean Ave (Water St), Edmonds2
2021-04-11 07:15Richmond Beach Saltwater Park1
2021-03-30 06:43Golden Gardens Park1
2021-04-16 13:18Edmonds Waterfront1
2021-04-17 05:55Discovery Park8
2021-04-05 14:20Seattle-Bremerton Ferry1
2021-04-14 06:47Discovery Park--West Point2
2021-04-07 08:17Point Defiance Park--Dune Peninsula & Wilson Way3
2021-04-06 13:42Edmonds-Kingston Ferry (Snohomish Co.)5
2021-04-03 06:49Restoration Point (restricted access)2
2021-04-02 13:44Edmonds-Kingston Ferry (Kitsap Co.)2
2021-04-15 08:16Chambers Bay Beach Access2
2021-03-27 16:48Port of Eglon2
2021-04-10 11:33Deer Lagoon10
2021-04-17 07:28Point No Point6
2021-04-05 12:59Double Bluff County Park15
2021-04-16 10:00Norwegian Point1
2021-03-20 10:26Port Gamble2
2021-03-26 17:30Tolmie SP2
2021-04-08 11:16Larrabee State Park5
2021-04-15 17:08Clark’s Point (Whatcom Land Trust)1
2021-03-23 07:43Port Ludlow4
2021-04-04 08:00Crockett Lake2
2021-04-04 11:48Deception Pass SP -- Cornet Bay/Hoypus Hill Unit6
2021-04-03 11:45Keystone Ferry Landing2
2021-04-13 17:32Port Townsend-Keystone Ferry (Island Co.)50
2021-04-14 15:06Fort Flagler SP -- Marrowstone Point1
2021-03-20 19:23Deception Pass SP -- North Beach12
2021-04-10 10:23Fort Flagler SP25
2021-04-12 12:00Deception Pass SP -- Cranberry Lake2
2021-03-29 08:05Port Townsend-Keystone Ferry (Jefferson Co.)97
2021-04-17 09:33Deception Pass SP -- West Beach4
2021-04-14 15:32Rosario Beach / Rosario Head2
2021-04-05 13:13Ebey's Landing9
2021-04-08 12:30Point Hudson4
2021-04-15 08:00Point Wilson76
2021-04-07 16:29Port Townsend Marine Science Center2
2021-04-11 17:30Washington Park, Anacortes9
2021-04-15 06:53Fort Worden SP5
2021-04-08 14:20Hastie Lake Rd beach access2
2021-04-17 11:24Ebey's Landing NHP--Fort Ebey--Gun Battery4
2021-03-23 09:08Rosario Strait (Skagit Co.)60
2021-04-09 16:56Libbey Beach County Park16
2021-04-03 13:13Peapod Rocks150
2021-03-27 12:39Discovery Bay2
2021-04-12Smith Island
2021-03-22 12:43Mendocino (town)2
2021-04-16 11:10Gardiner Beach4
2021-04-17 15:25Diamond Point9
2021-04-17 15:14Protection Island37
2021-03-30 14:38Anacortes to San Juan Islands ferry125
2021-04-13 16:31Sequim Bay2
2021-04-17 18:13Cattle Point4
2021-04-16 13:01John Wayne Marina3
2021-04-17 07:05Marlyn Nelson County Park1
2021-04-10 14:13San Juan Island--Turn Point County Park13
2021-04-11 08:47Three Crabs2
2021-03-27 11:45Dungeness NWR3
2021-04-11 12:37Saturna Island--East Point5
2021-03-27 14:40Dungeness Recreation Area10
2021-04-10 10:13Saturna Island--Narvaez Bay (Gulf Islands National Park Reserve)2
2021-04-11 17:43San Juan County Park7
2021-04-16 07:37South Pender Island--Brooks Point Park2
2021-04-14 14:36Oak Bay Islands Ecological Reserve4
2021-03-20 10:09Swartz Bay-Tswassen Ferry (WA water portion)1
2021-04-05 10:00Cadboro Bay10
2021-04-14 17:18Oak Bay--Cattle Point3
2021-04-14 16:00Trial Islands8
2021-04-15 20:01Victoria--McMicking Point2
2021-04-11 08:25Victoria--Glencoe Cove Park1
2021-04-17 07:44Crescent City Harbor--Elk Creek mouth3
2021-04-15 18:01Clover Point10
2021-03-31 12:07Holland Point4
2021-04-17 12:05Castle Rock NWR1
2021-04-17 09:55Victoria--Ogden Point Breakwater2
2021-04-10 07:03Point St. George--seawatch only1
2021-04-17 09:04Ediz Hook2
2021-04-15 13:45Island View Beach6
2021-03-24 15:40Active Pass2
2021-03-31 12:41Esquimalt--Macaulay Point1
2021-03-27 08:12Esquimalt--Saxe Point Park2
2021-03-25 17:45Ferry - Tsawwassen to Swartz Bay2
2021-04-12 07:19Ferry - Swartz Bay to Active Pass2
2021-04-10 09:36Portland Island25
2021-04-05 15:35Ruckle Park, Saltspring Island20
2021-04-14 07:35Ona Beach SP1
2021-04-03 12:50Bazan Bay Rd beach2
2021-04-17 11:21Fort Rodd Hill and Fisgard Lighthouse National Historic Site12
2021-04-14 15:26Tokatee Klootchman SP12
2021-04-17 15:45Siuslaw River--North Jetty3
2021-04-09 08:59Siuslaw River--South Jetty (jetty only)2
2021-03-21 10:08Sea Lion Pt. & Overlook3
2021-03-31 10:00Sea Lion Caves1
2021-04-07 07:05Siltcoos River Beach and Parking Area35
2021-04-16 16:08Tillamook Bay--Barview Jetty1
2021-04-15 19:12Esquimalt Lagoon30
2021-04-11 06:56Swartz Bay ferry terminal4
2021-04-12 10:02Yaquina Head Outstanding Natural Area--Lighthouse13
2021-04-14 07:20Boiler Bay State Wayside6
2021-04-04 08:52Rocky Creek State Park1
2021-04-14 06:35Elwha River Mouth -- west access11
2021-04-15 19:33Haystack Rock6
2021-04-17 06:55East Sooke Regional Park--Beechey Head4
2021-04-02 14:17Salt Creek County Park3
2021-04-09 15:00Cape Arago SP--Simpson Reef/Shell Island Viewpoint1
2021-03-20 11:29Westport Jetty1
2021-04-17 06:55Jordan River1
2021-03-27 12:15Westport--Offshore waters64
2021-03-27 09:40Westport--offshore waters Grays Canyon67
2021-04-17 06:56Ucluelet--Amphitrite Point13
2021-04-14 10:00Cormorant Channel4
2021-04-15 09:20Malcolm Island--Kaleva Road3
2021-04-06 08:16Malcolm Island--Dickenson Point1
2021-03-25 14:08Prince Rupert--Ferry Terminal2
2021-04-01 14:05Skidegate Landing to Alliford Bay ferry crossing1
2021-04-15 19:00Sitka Sound
2021-04-16 18:15Middleton Island (restricted)--Sea Lion point100
2021-04-15 14:30Middleton Island (restricted) (Gulf of Alaska)5
2021-03-28 05:00苫小牧〜大洗フェリー(青森県)Tomakomai~Oarai ferry (Aomori Prefecture)