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
2021-01-03 06:47Pt. Vicente--seawatch2
2020-12-28 06:59Pt. Dume1
2020-12-28 11:22Monterey Beach Hotel3
2021-01-19 09:35Pt. Pinos--general (sea & shore Coral to Jewell, Crespi Pond & cypresses)3
2021-01-13 17:01Pt. Pinos--seawatch only3
2020-12-29 10:15Monterey Bay pelagic (SCZ Co., >2 mi offshore)11
2021-01-15 09:51Santa Cruz Municipal Wharf1
2021-01-13 07:00Southeast Farallon Island (restricted access)1
2021-01-15 15:32Bodega Head - offshore species and the bluff ONLY1
2020-12-31 14:15Saltwater SP1
2021-01-03 13:26Des Moines Marina2
2021-01-16 09:27Marine View Park2
2021-01-18 14:48Dumas Bay Park1
2021-01-15 11:47Dash Point SP (King Co.)4
2021-01-13 11:02Jack Block Park1
2021-01-15 13:49Dash Point2
2020-12-27 11:40Haines Wharf Park2
2021-01-18 11:15Browns Pt. Lighthouse Park1
2021-01-11 12:00Browns Pt. Lighthouse Park1
2020-12-26 13:25Ruston Way--Chinese Reconciliation Park3
2021-01-16 14:09Carkeek Park2
2021-01-10 09:01Charles Richey Sr. Viewpoint1
2021-01-17 16:00Ruston Way--Dickman Mill Park1
2020-12-25 12:10Ocean Ave (Water St), Edmonds1
2021-01-13 08:18Alki (including north and south beaches)4
2021-01-18 08:42Richmond Beach Saltwater Park1
2021-01-19 07:40Four Mile Rock, Magnolia3
2021-01-01 10:25Shilshole Bay Marina1
2021-01-18 10:34Richmond Beach--Kayu Kayu Ac Park2
2021-01-18 09:28Edmonds Waterfront1
2021-01-19 07:55Discovery Park2
2021-01-19 09:22Point Defiance Park--Dune Peninsula & Wilson Way2
2021-01-13 12:51Point Defiance Park1
2021-01-07 07:44Restoration Point (restricted access)42
2020-12-22 08:52Seattle-Winslow Ferry (Kitsap Co.)2
2020-12-27 08:00Edmonds-Kingston Ferry (Kitsap Co.)1
2021-01-09 12:32Pritchard Park2
2021-01-16 11:31Port of Eglon1
2021-01-18 08:50Point No Point1
2021-01-18 09:17Tacoma DeMolay Sandspit Nature Reserve, Fox Island4
2021-01-14 12:50Norwegian Point2
2021-01-13 06:57Cama Beach State Park
2021-01-09 13:02Tolmie SP2
2020-12-22 14:16Key Peninsula--Home Public Boat Launch1
2021-01-15 15:15Fort Casey State Park15
2020-12-28 12:32Deception Pass SP-- Pass Island6
2020-12-27 12:40Fort Flagler SP8
2021-01-17 09:58Fort Flagler SP - Campground/Beach1
2021-01-19 12:33Deception Pass SP -- West Beach1
2021-01-16 12:01Rosario Beach / Rosario Head2
2021-01-19 16:24Point Hudson3
2021-01-12 11:33Point Wilson1
2020-12-23 15:40Swantown / Bos Lake4
2021-01-09 10:26Washington Park, Anacortes3
2020-12-27 12:30Fort Worden SP12
2021-01-08 10:46Washington Park -- Green Point2
2020-12-23 15:05Libbey Beach County Park2
2020-12-28 14:01Diamond Point1
2020-12-22 08:22Anacortes to San Juan Islands ferry2
2021-01-18 14:36Cattle Point1
2021-01-19 09:35Marlyn Nelson County Park2
2021-01-18 07:28Dungeness NWR1
2021-01-09 12:56Rueben Tarte County Park2
2021-01-01 13:57Lime Kiln Pt. SP2
2021-01-16 13:06San Juan County Park3
2021-01-13 14:16South Pender Island--Brooks Point Park1
2021-01-06 15:45Victoria--Cattle Point1
2020-12-31 10:58Victoria--McMicking Point10
2021-01-07 10:30Kitty Islet2
2021-01-15 01:43Victoria--Harling Point (including Chinese Cemetery)1
2021-01-17 14:20Clover Point1
2021-01-11 10:34Cordova Bay1
2021-01-18 13:38Victoria--Ogden Point Breakwater1
2021-01-02 08:22Ediz Hook2
2021-01-07 13:03Esquimalt--Macaulay Point1
2021-01-14 16:00Esquimalt--Saxe Point Park2
2020-12-29 13:30UBC--Cecil Green & Museum of Anthropology grounds1
2021-01-07 13:45Fort Rodd Hill and Fisgard Lighthouse National Historic Site6
2021-01-18 14:00Esquimalt Lagoon6
2020-12-29 12:15Yaquina Head Outstanding Natural Area2
2020-12-27 08:15Yaquina Head Outstanding Natural Area--Lighthouse1
2020-12-28 12:14Albert Head Lagoon Regional Park2
2020-12-29 08:10Race Rocks2
2021-01-13 09:45Silver Point2
2020-12-27 07:58Rocky Point Bird Observatory (restricted access)9
2020-12-28 14:23East Sooke Park--Aylard Farm1
2021-01-15 09:49East Sooke Regional Park--Beechey Head8
2020-12-23 09:59East Sooke Regional Park5
2020-12-27 11:41East Sooke Regional Park - Pike Point1
2020-12-27 14:30Sooke Point Ocean Cottage Resort22
2020-12-29 15:17Port Orford Dock2
2020-12-31 11:05Sooke--Otter Point1
2020-12-27 08:03Pipers Lagoon1
2020-12-27 15:00Nanaimo--Neck Point Park1
2021-01-18 13:23Ucluelet, Helen Road1
2021-01-19Sitka (town)1