The Pacific loon or Pacific diver (Gavia pacifica), is a medium-sized member of the loon, or diver, family. It may be conspecific with black-throated diver/Arctic loon, which it closely resembles. The genus name Gavia comes from the Latin for "sea mew", as used by ancient Roman naturalist Pliny the Elder. The specific epithet pacifica is Latin for the Pacific Ocean, the term meaning "peaceful".

It breeds on deep lakes in the tundra region of Alaska and northern Canada as far east as Baffin Island, and in Russia east of the Lena River.

Unlike other loons/divers, this bird may migrate in flocks. It winters at sea, mainly on the Pacific coast, or on large lakes over a much wider range, including China, Japan, North Korea, South Korea, United States and Mexico. It has occurred as a vagrant to Greenland, Hong Kong, Great Britain, Spain, Finland and Switzerland (Dec 2015).

Breeding adults are like a smaller sleeker version of great northern diver/common loon. They measure 58–74 cm (23–29 in) in length, 110–128 cm (43–50 in) in wingspan and weigh 1–2.5 kg (2.2–5.5 lb). They have a grey head, black throat, white underparts and chequered black-and-white mantle. Non-breeding plumage is drabber with the chin and foreneck white. Its bill is grey or whitish and dagger-shaped. In all plumages, lack of a white flank patch distinguishes this species from the otherwise very similar black-throated diver/Arctic loon.

This species, like all divers/loons, is a specialist fish-eater, catching its prey underwater. It flies with neck outstretched.

The call is a yodelling high-pitched wailing, as well as harsh growls and barks.
Pacific Loon
Date Location Count
2019-12-02 10:00Avalon--8th St. Jetty (Avalon Seawatch 2015-present)1
2019-12-02 11:15Watch Hill Lighthouse1
2019-12-08 10:00East Fork SP--South Beach1
2019-12-07 08:15East Fork SP--South Side1
2019-12-03 11:03East Fork SP--Dam1
2019-11-30 07:30Race Point1
2019-11-29 12:31J. Percy Priest Lake--Seven Points picnic area1
2019-12-03 13:10J. Percy Priest Lake2
2019-12-06 10:07J. Percy Priest--Cooks Rec Area1
2019-11-30 10:56J. Percy Priest Dam2
2019-12-08 14:53J. Percy Priest Lake--Anderson Rd Rec Area1
2019-11-27 16:20J. Percy Priest Lake--Elm Hill Recreation Area1
2019-12-04 14:00Sledd Creek Boat Ramp1
2019-12-06 15:12Ross Barnett Reservoir--Madison County1
2019-12-08 11:30Pomona Lake--Michigan RA1
2019-12-07 14:16Pomona Lake--Dam & Outlet Park1
2019-12-08 08:45Pomona Lake1
2019-12-07 06:31Neegronda Reservoir1
2019-12-03 08:43Aurora Reservoir1
2019-12-06 11:35Rueter-Hess Reservoir (restricted access)1
2019-12-01 09:57Pueblo Reservoir--Sailboard area1
2019-12-10Pueblo Reservoir1
2019-12-01 13:50Pueblo Reservoir--North Shore Marina1
2019-12-08 14:54Chatfield SP (Douglas Co)1
2019-12-08 07:34Chatfield SP--N Boat Ramp area1
2019-12-02 12:37Chatfield SP (Jefferson Co)1
2019-12-01 15:21Lathrop State Park1
2019-11-28 15:00Gardiner Dam1
2019-11-27 16:20Willow Springs Lake1
2019-12-07 14:35Prescott--Willow Lake1
2019-12-05 13:38Empalme--Cuenca del Barco3
2019-11-30 07:49Lake Mead NRA--Boulder Beach1
2019-12-05 14:19Kelowna--Rotary Beach1
2019-12-05 16:02Kelowna--Maude-Roxby Sanctuary1
2019-12-09 13:30Las Vegas - Sunset Park1
2019-12-08 13:45Lake Perris State Recreation Area2
2019-12-09 08:10Lake Sammamish SP1
2019-12-09 09:03Playa Punta Estero5
2019-12-07 11:20Kayak Point County Park2
2019-11-29 10:30Blaine Marine Park1
2019-12-06 14:04Sandy Point1
2019-12-08 08:30White Rock Pier2
2019-12-07 11:04Birch Bay State Park1
2019-11-30 10:00Sandy Hook (Whidbey Is.)2
2019-12-07 11:13Blackie Spit (Incl. Dunsmuir Farm & Nicomekl estuary)2
2019-12-08 08:00Edmonds Waterfront3
2019-11-29 09:15Dave Mackie County Park1
2019-12-09 09:48Deer Lagoon1
2019-12-01 10:55Carkeek Park4
2019-12-07 09:23Point No Point16
2019-12-02 13:08Discovery Park2
2019-12-08 14:38Kingston Ferry Terminal1
2019-12-01 07:52San Dieguito Lagoon--southwest4
2019-11-30 08:55Anacortes to San Juan Islands ferry1
2019-11-30 08:35Driftwood Key4
2019-12-06 07:29San Diego River--tidal mudflats1
2019-12-03 10:17Watmough Bay Preserve, Lopez Island1
2019-11-29 07:45Mission Bay--San Juan Cove6
2019-12-08 07:15Point La Jolla--seawatch
2019-11-29 11:15Coast Boulevard Park72
2019-12-08 07:43Restoration Point (restricted access)16
2019-11-30 06:44Oceanside Pier1
2019-12-07 13:04North Vashon Ferry Terminal3
2019-12-09 15:44Cattle Point4
2019-12-10 14:55Jackson Beach2
2019-12-07 12:59Rueben Tarte County Park1
2019-12-01 10:38Bowen Island--Cape Roger Curtis Lighthouse7
2019-12-10 15:01Gardiner Beach48
2019-12-02 11:49Pender Island - Medicine Beach1
2019-12-05 07:30Active Pass2
2019-12-08 12:57North Pender Island--Shingle Bay3
2019-12-08 08:25Roberts Creek Jetty1
2019-12-02 11:04Tsawwassen--Duke Point Ferry9
2019-12-09 15:20Jack Road Ocean Viewpoint38
2019-12-05 09:20Wilson Creek estuary5
2019-12-07 12:20Victoria--Cattle Point2
2019-12-08 08:00Sechelt--Mission Point4
2019-12-10 12:22Mount Douglas Park--Beach2
2019-12-10 07:13Crystal Cove SP--Pelican Point2
2019-12-09 13:35Kitty Islet2
2019-12-08 10:32Saanichton Bay8
2019-12-06 10:40Dungeness Recreation Area10
2019-12-04 14:17Bazan Bay Rd beach1
2019-12-02 08:30Billy Frank Jr. Nisqually NWR1
2019-12-05 14:55Victoria--Harling Point (Chinese Cemetery)1
2019-12-08 11:10Clover Point5
2019-12-07 08:00Lake Palmdale1
2019-12-09 13:22Esquimalt--Saxe Point Park3
2019-12-09 11:10Cherry Point--Garnett Rd.7
2019-12-07 11:29Chemainus River Estuary--Swallowfield Rd access8
2019-12-10 13:30Ediz Hook1
2019-12-06 12:39Pipers Lagoon14
2019-12-09 10:40Nanaimo--Neck Point Park1
2019-11-30 11:22Belmont Pier and shore1
2019-12-06 09:46East Sooke Regional Park--Beechey Head12
2019-12-09 12:22Sooke--Whiffin Spit Park5
2019-11-29 14:21Cabrillo Beach Park1
2019-12-10 15:30Santa Catalina Channel (LA Co.)6
2019-12-03 09:30Rathtrevor Beach Provincial Park39
2019-12-06 08:50Englishman River Estuary--Plummer Rd side8
2019-12-01 15:25Parksville Community Park1
2019-12-08 13:15Parksville Bay14
2019-12-03 13:33Dockweiler SB2
2019-12-10 15:00Columbia Beach22
2019-11-30 14:42Powell River--Sliammon Point4
2019-12-10 09:07Qualicum Beach--Viewing Platform2
2019-12-08 01:44Josephine Islands2
2019-11-28Little Qualicum estuary
2019-12-10 16:00Malibu Lagoon1
2019-12-03 14:25Deep Bay1
2019-12-07 12:20Comox--Air Force Beach1
2019-12-02 12:56Comox--Marina Park5
2019-11-30 09:44Royston--Gartley Road5
2019-12-02 13:57Royston--Hilton Rd waterfront1
2019-12-07 12:15Rebecca Spit Provincial Park3
2019-12-05 13:30Oyster Bay1
2019-12-09 09:54Leo Carrillo SP2
2019-12-02 08:53Campbell River - Quathiaski Cove ferry15
2019-12-08 15:09Campbell River--Willow Point8
2019-12-08 11:20Campbell RIver--Robert V. Ostler Park2
2019-12-08 09:00Campbell River--Tyee Spit11
2019-11-30 11:00Ripple Rock Hike Lookout1
2019-12-09 11:53Neah Bay--town and bay only2
2019-11-30 14:30Point Grenville1
2019-12-05 08:32Marina Park (VEN Co.)1
2019-12-07 07:52Westport (general)1
2019-12-07 13:48Ocean Shores -- Pt. Brown Jetty2
2019-12-06 10:41Santa Barbara Channel--east channel (VEN Co.)3
2019-11-29 11:00Cape Disappointment SP--Lewis and Clark Interpretive Center1
2019-11-30 10:15Seaside Cove1
2019-12-07 10:51Santa Cruz Island--Pelican Bay2
2019-11-29 10:14Campus Pt.1
2019-12-02 09:09Cape Kiwanda SP2
2019-11-27 07:55Lake Almanor--Super Ditch1
2019-12-07 10:45Malcolm Island--Kaleva Road4
2019-11-30 09:10D River Beach Wayside2
2019-12-07 15:23Siletz Bay NWR--Alder Island1
2019-12-08 11:30Shiels Bay, Malcolm Island15
2019-12-08 09:45Malcolm Island--Bere Point7
2019-12-10 11:03Boiler Bay State Wayside2
2019-12-08 09:00MK Bay Marina2
2019-12-07 09:31Mark Hatfield Marine Science Center and Estuary Trail1
2019-12-07 14:45Yaquina Bay SP1
2019-12-08 13:15Yaquina River--North Shore1
2019-11-30 13:15Seal Rock--Pullouts south on Hwy. 1011
2019-12-07 11:55Alsea Bay--Lower Bay2
2019-11-30 14:35Port Hardy--Waterfront (Hardy Bay)3
2019-11-27 14:18Ocean Beach County Park11
2019-11-29 09:57Smelt Sands SP & 804 Trail (north of Adobe)3
2019-12-05 10:02Yachats SP1
2019-11-29 08:41Tokatee Klootchman SP2
2019-12-01 09:00Port San Luis1
2019-12-09 14:30Morro Bay SP--Marina/Boardwalk Trail1
2019-12-05 10:35Morro Bay harbor mouth1
2019-12-09 09:40Siuslaw River--North Jetty8
2019-12-02 08:47Islay Creek Mouth--Montana de Oro SP2
2019-12-04 08:18Siuslaw River--South Jetty (general)5
2019-12-08 09:36San Simeon Pier1
2019-11-30 07:53San Simeon Point5
2019-11-29 12:10Jordan Cove2
2019-11-30 10:18North Spit--Jarvis Turn Bayside Trail1
2019-11-29 14:00Charleston Boat Basin1
2019-12-05 09:34Elkhorn Slough Reserve (NERR)1
2019-12-10 13:03Moonglow Dairy1
2019-12-09 11:22Bullards Beach SP2
2019-12-04 11:50Moss Landing--jetties, channel and/or seawatch only1
2019-12-08 13:16Moss Landing SB3
2019-12-03 15:14Bandon Sewage Plant Cove1
2019-12-05 09:42Harp's Restaurant Dock1
2019-11-29 10:45Coquille River--South Jetty 2
2019-12-09 08:03Monterey Harbor3
2019-11-28 13:00Monterey Coast Guard pier/Cannery Row seawatch1
2019-12-09 13:20Monterey Bay pelagic--inshore Monterey Harbor to Pt. Pinos (MTY Co.)12
2019-12-05 10:00Pacific Grove--Otter Pt.384
2019-12-06 11:00Castle Rocks (MTY Co.)500
2019-12-07 09:00Pt. Pinos--general (sea & shore Coral to Jewell, Crespi Pond, cypresses etc)723
2019-12-10 15:00Pt. Pinos--seawatch only7
2019-12-03 10:39Carmel River SB (beach, lagoon, and/or Cross Hill)44
2019-12-03 09:56Monastery Beach1
2019-11-27 11:05Asilomar SB--rocky shore only [Jewell to Asilomar, west of Sunset]1
2019-12-05 08:35Asilomar SB--sandy beach to Spanish Bay4
2019-12-09 10:1721st Beach2
2019-11-29 10:45Sunny Cove2
2019-12-08 10:19Pebble Beach--Bird & Seal Rocks, 17-Mile Dr.418
2019-12-08 10:33Santa Cruz Municipal Wharf1
2019-11-30 10:23Lighthouse Pt.90
2019-12-05 11:46West Cliff Dr.--western (Lighthouse Pt. to Swanton Blvd.)1
2019-11-30 11:20West Cliff Dr. at Stockton Ave.15
2019-12-06 07:48Natural Bridges SB--overlook1
2019-12-09 09:00Monterey Bay pelagic (MTY Co.)22
2019-12-01 14:04Arizona Beach State Recreation Site1
2019-11-28 12:10Wilder Ranch SP (general area)1
2019-12-03 13:30Crown Memorial SB--Crab Cove area1
2019-11-27 13:50Ballena Bay1
2019-12-08 08:45Ketchikan (town)70
2019-11-28 10:39Waddell Bluffs1
2019-12-10 12:16Smith River--Ship Ashore Resort1
2019-12-06 08:20Chetco River--Port of Brookings-Harbor1
2019-12-08 09:30Chetco River--South Jetty1
2019-12-09 07:00Heron's Head Park1
2019-12-10 09:00Pigeon Pt.1
2019-11-30 11:14Marina Green1
2019-12-08 09:35Presidio--general (use for long traveling checklists encompassing multiple hotspots)1
2019-12-09 09:45Presidio--Crissy Field Wildlife Protection Area1
2019-12-10 14:36Presidio--Battery Godfrey1
2019-12-04 11:44Point St. George--seawatch only15
2019-12-08 15:16Pillar Point Harbor1
2019-12-10 09:58Redwood NP coastline--Redwood Creek to Mussel Pt.1
2019-11-29 09:22Stinson Beach22
2019-12-05 09:35Redwood NP--Thomas H Kuchel Visitor Center1
2019-11-29 16:00Seadrift Beach1
2019-11-29 12:00Pt. Reyes--Coast Camp3
2019-12-10 09:43Tomales Bay--general area4
2019-12-08 08:35Pt. Reyes--Estero Trail1
2019-11-30 09:30Humboldt Bay Bird Observatory (restricted access)1
2019-11-29 16:15Pt. Reyes--Drakes Beach1
2019-11-27 12:42Pt. Reyes--Fish Docks2
2019-12-08 11:17Pt. Reyes--Pt. Reyes Beach South75
2019-12-09 08:00Southeast Farallon Island—restricted access1
2019-12-02 12:35Eureka Waterfront--D St. parking lot/boardwalk2
2019-12-08 08:00Eureka Waterfront--Marina Way4
2019-11-28 08:36Campbell Cove and Hole in the Head - ONLY1
2019-11-29 09:20Eureka Waterfront--Del Norte St. fishing pier5
2019-12-02 11:59Bodega Head - offshore species and the bluff ONLY1
2019-12-04 08:15North Spit--Bay St.65
2019-11-29 11:11Eureka Waterfront--Truesdale St.2
2019-11-29 12:00Eureka Waterfront--Elk River mouth2
2019-12-07 11:18Masset--Cemetary Rd beach access2
2019-12-08 15:00Tlell--Pesuta Trail2
2019-11-27 14:00Humboldt Bay--Samoa Boat Ramp Cty. Pk.2
2019-11-28 09:10North Spit--Samoa Dunes Rec Area1
2019-12-08 09:24Humboldt Bay--King Salmon2
2019-12-08 09:15Humboldt Bay--North Spit jetty200
2019-11-30 10:18Humboldt Bay--Fields Landing Boat Ramp5
2019-12-06 10:23Sandspit--airport3
2019-12-06 09:57Sandspit--Coast Guard base and marina1
2019-12-06 09:10Haida Gwaii--Onward Point Trail, Moresby Island1
2019-12-07 08:30Port Clements2
2019-12-06 14:25Skidegate Landing to Alliford Bay ferry crossing4
2019-12-09 12:00Haida Gwaii--Skidegate Inlet BC IBA1454
2019-12-03 08:40MacKerricher SP--Laguna Pt. parking lot1
2019-11-28 07:25Noyo Headlands Park20
2019-11-28 14:25Stanford Inn2
2019-12-08 09:40Van Damme SP- Beach1
2019-11-27 08:39Garcia River mouth1
2019-11-27 06:40Point Arena Lighthouse area200
2019-11-29 02:21Gustavus--ferry dock4
2019-11-27 10:30Gustavus--Forelands-W of dock to Critical Habitat boundary2
2019-11-30 11:20Glacier Bay NP--Bartlett Cove2
2019-12-03Sitka Nat. Historical Park1
2019-12-08Sitka (town)1
2019-12-09 14:00Sitka--Halibut Point SRS
2019-11-29 11:35Seldovia--Outside Beach, Campground, & RV Park10