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
2021-07-02 06:41Newport Pier1
2021-06-30 10:24Prisoner's and Scorpion's harbors transfer (inshore)2
2021-07-17 11:27Margo Dodd Park3
2021-07-22 11:24Pt. Pinos--general (sea & shore Coral to Jewell, Crespi Pond & cypresses)1
2021-07-11 08:29Pt. Pinos--seawatch only1
2021-07-03 08:00Monterey Bay pelagic (SCZ Co., >2 mi offshore)2
2021-06-30 09:03Monterey Bay pelagic (MTY Co.)2
2021-07-23 10:00Año Nuevo SP -- Año Nuevo Island (Restricted Access)6
2021-07-24 08:38Pigeon Pt.1
2021-07-22 11:42Lands End1
2021-07-21 08:15Devil's Slide Trail and Egg Rock4
2021-07-11 15:31Farallon Islands pelagic (MRN Co.)1
2021-07-10 09:30Pt. Reyes--Abbotts Lagoon1
2021-07-16 07:00Farallon Islands pelagic (SF Co.)20
2021-07-25 12:30Southeast Farallon Island (Farallon Islands NWR)--Nearshore Waters (less than 2 mi.) - including seabird colonies6
2021-07-25 07:00Southeast Farallon Island (Farallon Islands NWR, restricted access)200
2021-07-05 06:38Pt. Reyes--Lighthouse1
2021-07-06 14:13Hwy 1--Salmon Creek to Bridgehaven5
2021-07-14 11:38Hat Island ferry crossing10
2021-07-24 05:58Mukilteo Ferry Terminal30
2021-07-03 19:32Myrtle Edwards Park / Centennial Park1
2021-07-08 14:29Tulalip Bay1
2021-07-01 08:55Dash Point1
2021-07-11 09:30Mukilteo-Clinton Ferry2
2021-07-21 11:23Carkeek Park1
2021-07-25 05:42Charles Richey Sr. Viewpoint10
2021-07-22 07:45Ocean Ave (Water St), Edmonds12
2021-07-23 06:30Alki (including north and south beaches)3
2021-07-26 06:32Richmond Beach Saltwater Park3
2021-07-15 17:47Sunset Hill Park
2021-07-24 06:01Golden Gardens Park5
2021-07-16 08:51Richmond Beach--Kayu Kayu Ac Park2
2021-07-23 09:43Edmonds Waterfront5
2021-07-26 08:48Discovery Park1
2021-07-23 08:34Discovery Park--West Point30
2021-07-06 10:31Point Defiance Park--Dune Peninsula & Wilson Way3
2021-07-23 09:29Edmonds-Kingston Ferry (Snohomish Co.)11
2021-07-14 06:06Restoration Point (restricted access)8
2021-07-23 09:08Chambers Bay Beach Access1
2021-07-08 08:24Murden Cove & Estuary1
2021-06-29 05:43Deer Lagoon4
2021-07-25 09:09Point No Point1
2021-07-10 14:25Norwegian Point30
2021-07-17 10:39Point Julia (restricted access)12
2021-06-30 07:56Driftwood Key4
2021-07-22 08:43Mutiny Bay34
2021-07-24 07:20Nature Conservancy Foulweather Bluff Preserve1
2021-07-17 07:45Foulweather Bluff12
2021-07-05 12:25Gualala Point Regional Park1
2021-07-25 16:31Kiket Island2
2021-07-10 17:56East Beach Park, Marrowstone Island4
2021-07-24 08:22Keystone Ferry Landing100
2021-06-27 07:04Port Townsend-Keystone Ferry (Island Co.)17
2021-07-25 19:15Fort Flagler SP -- Marrowstone Point6
2021-07-22 12:10Fort Casey State Park2
2021-07-15 11:50Strawberry Island10
2021-07-02 10:48Deception Pass SP -- North Beach1
2021-07-08 15:45Jack Island2
2021-07-18 16:00Fort Flagler SP1
2021-07-10 11:06Oak Bay County Park3
2021-07-18 07:12Deception Pass SP -- Cranberry Lake1
2021-07-20 11:30Deception Pass SP -- Bowman Bay10
2021-07-08 06:29Deception Pass SP320
2021-07-24 08:10Vendovi Island10
2021-07-03 18:08Lighthouse Point3
2021-07-26 09:46Fort Flagler SP - Campground/Beach150
2021-07-14 10:50Deception Pass SP--Dunes Interpretive Trail at West Beach1
2021-07-25 12:21Port Townsend-Keystone Ferry (Jefferson Co.)20
2021-06-29 06:01Deception Pass SP -- West Beach5
2021-07-24 10:38Ebey's Landing1
2021-07-21 11:49Point Hudson2
2021-07-03 11:30Joseph Whidbey SP2
2021-07-17 11:12Port Townsend ferry terminal1
2021-07-23 15:02Point Wilson25
2021-07-08 12:22Port Townsend Marine Science Center2
2021-07-14 08:49Washington Park, Anacortes17
2021-07-21 19:09Fort Worden SP13
2021-07-18 16:35Hastie Lake Rd beach access3
2021-07-24 10:30Washington Park -- Green Point
2021-07-12 15:45Sinclair Island4
2021-07-03 14:01Fort Ebey State Park7
2021-07-25 10:03Rosario Strait (Skagit Co.)71
2021-07-24 18:52Port Townsend -- North Beach560
2021-06-30 16:36Port Townsend--Larry Scott Trail--bluff2
2021-07-22 13:50Libbey Beach County Park2
2021-07-25 16:22Sandy Point3
2021-07-24 10:26Rosario Strait (San Juan Co. side)75
2021-07-21 12:33Minor Island22
2021-07-24 16:00Smith Island5
2021-07-20 10:50Point Colville60
2021-07-23 07:57Gardiner Beach25
2021-07-05 12:05Mendocino Headlands SP2
2021-07-22 08:30Diamond Point1
2021-06-27 10:46South Caspar Headlands 3
2021-07-21 17:55Protection Island2
2021-07-20 17:48San Juan Islands ferry6
2021-07-23 16:31Iceberg Point, Lopez Island5
2021-07-05 07:30Nearshore pelagic (MEN Co.)5
2021-07-21 11:55Whale Rocks2
2021-07-13 17:00Crescent Beach, Orcas Island1
2021-07-02 19:49Goose Island8
2021-07-26 06:44Cattle Point60
2021-07-25 18:00John Wayne Marina6
2021-07-18 10:05Brandt's Landing Marina, Orcas Island30
2021-07-24 15:46Gibson Spit3
2021-07-05 07:00Marlyn Nelson County Park3
2021-07-26 06:53South Beach, San Juan Island12
2021-07-17 07:45Fourth of July Beach14
2021-07-23 19:07American Camp10
2021-07-02 17:59San Juan Island--Jackson Beach1
2021-07-25 13:30Friday Harbor -- Harbor area2
2021-07-22 16:14Deer Harbor, Orcas Island5
2021-07-26 09:00Three Crabs8
2021-07-18 09:21False Bay4
2021-07-11 16:19Dungeness Landing Park/Oyster House6
2021-07-16 06:06Dungeness NWR1750
2021-07-09 18:45Westside Scenic Preserve10
2021-07-03 17:56Lime Kiln Pt. SP2
2021-07-20 13:35San Juan County Park2
2021-07-12 12:23Wilson Creek mouth1
2021-07-15 15:36Discovery Island2
2021-07-09 16:13Tsawwassen Ferry Terminal Jetty1
2021-07-11 12:05Trinidad Head1
2021-07-17 07:23South Pender Island--Brooks Point Park1
2021-07-16 08:30Patricks Point SP--Wedding Rock1
2021-07-17 12:05Ten Mile Point--White Rock St and Baynes Rd42
2021-07-14 20:24Victoria--10 Mile Point2
2021-07-09 16:17Swartz Bay-Tswassen Ferry (WA water portion)2
2021-07-09 09:10Cadboro Bay70
2021-07-26 08:23Oak Bay--Cattle Point1
2021-07-09 07:48Trial Islands35
2021-07-23 08:30Victoria--McMicking Point175
2021-07-12 18:25Saanich - Gyro Park1
2021-07-09 07:29Darcy Island1
2021-07-16 10:13Uplands Park1
2021-07-14 18:02Kitty Islet
2021-07-13 20:00Haro Road access1
2021-07-09 17:16Oak Bay3
2021-07-25 15:10Oak Bay--Bowker Avenue2
2021-07-25 14:30Oak Bay--Trafalgar Park120
2021-07-17 10:30Victoria--Harling Point (including Chinese Cemetery)110
2021-07-05 08:22Crescent City Harbor3
2021-07-08 14:30Crescent City Harbor--B Street pier1
2021-07-24 18:00Mandarte Island30
2021-07-08 14:30Crescent City Harbor--Battery Point Lighthouse & Jetty1
2021-07-23 07:24Clover Point1
2021-07-06 17:25Crescent City--Pebble Beach1
2021-07-23 09:00Port Angeles City Pier4
2021-07-14 16:30Cordova Bay9
2021-07-22 08:10Holland Point3
2021-07-21 10:29Sidney Spit (Gulf Islands National Park Reserve)7
2021-07-01 07:45Victoria--Ogden Point Breakwater3
2021-07-18 19:47Ediz Hook1
2021-07-16 17:48Island View Beach3
2021-06-29 18:18Tillamook Bay--Garibaldi Marina8
2021-07-06 08:18Winema Overlook2
2021-07-14 15:17James Island Pier4
2021-07-22 10:00Tillamook Bay--Garibaldi Public Pier13
2021-07-23 14:08Tillamook Bay--Garibaldi Roadside Bay Overlook4
2021-07-16 09:50Roads End SP1
2021-07-22 09:35Barview Tide Pool1
2021-07-02 06:50Siletz Bay--Salishan Nature Trail1
2021-07-20 07:15Siuslaw River--North Jetty-Mudflats6
2021-06-29 07:09Carl Washburne SP2
2021-07-06 11:46Yaquina River--SE Jetty Way1
2021-07-25 16:34Painted Rock6
2021-07-01 13:38Siuslaw River--South Jetty-Crab Docks2
2021-07-20 08:55Siuslaw River--South Jetty (general)1
2021-07-22 07:21Tokatee Klootchman SP1
2021-07-15 09:55Neptune SP--North4
2021-07-06 16:50Siuslaw River--North Jetty3
2021-07-21 08:22Siuslaw River--South Jetty (jetty only)1
2021-07-14 09:45Bob Creek Wayside4
2021-07-16 11:46Sea Lion Pt. & Overlook1
2021-07-15 13:15Sea Lion Caves2
2021-07-20 10:30Siltcoos River Beach and Parking Area2
2021-07-10 10:08Smelt Sands SP & 804 Trail (north of Adobe)5
2021-07-22 08:55Tillamook Bay--Barview Jetty7
2021-07-18 08:20Esquimalt Lagoon2
2021-07-07 12:15Yaquina River--South Jetty2
2021-07-18 08:00Nehalem Bay SP1
2021-07-24 08:52Yaquina Head Outstanding Natural Area1
2021-07-23 08:34Devils Punchbowl SP1
2021-06-30 14:05Boiler Bay State Wayside6
2021-07-09 13:03Fulford to Swartz Bay Ferry1
2021-07-16 13:50Neahkahnie Mt. Wayfinding Point2
2021-07-08 11:50Elwha River mouth500
2021-07-10 09:21Witty's Lagoon Regional Park1
2021-07-16 09:00Elwha River Mouth -- west access40
2021-07-19 11:01Silver Point3
2021-07-23 06:30Haystack Rock1
2021-07-26 04:56Rocky Point Bird Observatory (restricted access)25
2021-07-12 15:17Ecola SP1
2021-06-27 11:43Fossil Point1
2021-07-05 20:00Freshwater Bay1
2021-07-12 16:05Mill Bay--Handy Road boat launch1
2021-07-23 10:43Fort Stevens SP6
2021-07-11 11:09Fort Stevens SP--South Jetty/Parking Area C2
2021-07-19 08:13East Sooke Regional Park--Beechey Head5
2021-07-24 09:43Salt Creek County Park2
2021-06-30 15:00Port Orford Head SP--Cove Trail3
2021-07-17 10:00Newport pelagic--northwest route 5-22 miles offshore5
2021-07-22 10:54Lyre Conservation Area5
2021-07-25 07:25Sooke--Otter Point4
2021-07-24 15:55Westport -- Marina10
2021-06-28 13:37Westport Jetty3
2021-07-24 16:12Ocean Shores--Pt. Brown Jetty5
2021-07-24 14:46Westport pelagic--inshore123
2021-07-19 11:20Sheringham Point Lighthouse5
2021-07-16 05:45Jordan River26
2021-07-07 18:05China Beach3
2021-07-12 17:49Olympic NP--Hwy 101 Overlook N of Kalaoch campground, WA30
2021-07-25 07:48Olympic NP--Beach 41
2021-07-24 11:45Westport pelagic--Offshore waters33
2021-07-14 16:22Shipwreck Point6
2021-07-09 07:30Juan de Fuca Provincial Park--Botanical Beach3
2021-07-19 16:13La Push2
2021-07-24 16:22Neah Bay--The Wedge
2021-06-28 19:54Columbia Beach1
2021-07-24 10:00Westport pelagic--offshore waters Grays Canyon14
2021-07-10 10:23Westport pelagic--offshore (west) of Grays Canyon2
2021-07-20 09:30Lund1
2021-07-17 20:00Mitlenatch Island Provincial Park9
2021-07-18 08:55Oyster Bay1
2021-07-02 09:15Barkley Sound3
2021-07-16 16:04Campbell River--Tyee Spit1
2021-07-25 17:05Ucluelet--Amphitrite Point2
2021-07-01 09:17Pacific Rim National Park--Long Beach, Incinerator Rock10
2021-07-17 09:05Tofino pelagic--inshore waters14
2021-07-24 10:33Cleland Island6
2021-07-10 12:10Telegraph Cove2
2021-07-12 07:45Alder Bay RV Park & Marina15
2021-07-11 12:30Alert Bay--Cormorant Island2
2021-07-20 08:37Malcolm Island--Kaleva Road18
2021-07-11 09:43Nimpkish River Estuary3
2021-07-21 15:47Malcolm Island--Dickenson Point46
2021-07-14 10:01Port Hardy--Glen Lyon Hotel27
2021-07-07 10:46Cape Scott3
2021-07-09 10:30Campania Island--McMicking Inlet400
2021-07-08 06:00Prince Rupert--Duncan Bay2
2021-07-22 22:40Lucy Island3
2021-07-18 20:00Sitka Sound
2021-07-25 13:46St. Lazaria Island NWR (Sitka Sound)1
2021-07-03Glacier Bay NP--Glacier Bay1
2021-07-06 17:25Middleton Island (restricted)--Sea Lion point48
2021-07-20 14:30Middleton Island (restricted) (Gulf of Alaska)300
2021-07-03 13:59College Fjord (Port Wells, Prince William Sound)1
2021-07-14 13:22Resurrection Bay (Seward)5
2021-07-09 08:00No Name Island (S end-Resurrection Bay)3
2021-07-18 09:30Resurrection Bay--Cheval Narrows1
2021-07-08 11:30Seward--Small Boat Harbor
2021-07-01 06:00Beehive Island (S of Chiswell Is.)1
2021-07-25 12:29Chiswell Islands (S of Aialik Bay-Gulf of Alaska)12
2021-07-18 13:00Kenai Fjords NP--Aialik Bay100
2021-07-26 08:52Kenai Fjords NP--Aialik Bay-Holgate Head15
2021-06-28 12:00Kenai Fjords NP--Quicksand Cove3
2021-07-16 15:02Kenai Fjords NP--Crater Bay & Harris Bay1
2021-07-24 13:13Kenai Fjords NP--Northwestern Fiord10
2021-07-20 09:00Kenai Fjords NP6
2021-07-24 10:30Homer Spit--Lands End2
2021-07-14 06:30Kodiak Is.--Marine-off Spruce Cape/Hourglass Reef2
2021-06-28 04:20羽幌町--天売島IBA (Haboro--Teuri Island IBA (island))
2021-06-27 12:29八戸〜苫小牧フェリー--函館正面 (Hachinohe~Tomakomai Ferry--Off Hakodate)1