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
2020-07-08 16:00Churchill--Granary Ponds1
2020-06-13 14:41Churchill--Cape Merry100
2020-07-08 23:25Marcil Lake--outflow1
2020-06-18 05:34Daniels Reservoir1
2020-06-20 08:29Salton Sea--Obsidian Butte1
2020-06-28 06:30Lake Perris State Recreation Area1
2020-06-10 06:53Santa Ana River mouth1
2020-06-24 16:13Pt. Vicente--fishing access1
2020-06-13 07:34Pt. Dume1
2020-06-26 10:26Leo Carrillo SP--seawatch1
2020-06-13 14:40Prelude Lake area1
2020-06-10 14:54Morro Bay Harbor1
2020-06-28 06:29Cayucos Pier1
2020-06-23 16:37Yellowknife--Niven Lake2
2020-06-10 20:28Yellowknife--Sewage Outlet and Road1
2020-06-19 14:56San Simeon Pier1
2020-06-19 11:40Arroyo Laguna1
2020-06-13 08:22Andrew Molera SP--Big Sur River mouth2
2020-07-02 14:22Pt. Pinos--seawatch only1
2020-06-10 07:20Asilomar SB--rocky shore only [Jewell to Asilomar, west of Sunset]3
2020-06-12 10:36Ano Nuevo SP--Visitors Center, Elephant Seals and all trails1
2020-06-18 19:52Blufftop Coastal Park and Poplar Beach1
2020-06-20 08:00Half Moon Bay SB--Venice Beach and Pilarcitos Creek Mouth4
2020-06-16 11:37Sutro Heights--Baths / Land's End4
2020-06-26 06:10Rodeo Lagoon1
2020-06-18 06:55Rodeo Beach and offshore only1
2020-06-14 10:30Slide Ranch1
2020-06-21 08:50Pt. Reyes--Limantour Beach26
2020-06-13 07:46Pt. Reyes--Abbotts Lagoon Trailhead1
2020-07-08 09:57Pt. Reyes--Drakes Beach (do not include Horseshoe Pond or beach/estero beyond Horseshoe Pond)7
2020-06-26 12:56Dillon Beach--Tomales Bay mouth44
2020-07-07 11:06Pt. Reyes--Pt. Reyes Beach North6
2020-06-14 10:25Pt. Reyes--Fish Docks6
2020-06-14 11:31Pt. Reyes--New Willows15
2020-07-03 13:00Doran Regional Park - entrance pond to jetty2
2020-06-27 10:21Bodega Head - offshore species and the bluff ONLY15
2020-06-18 04:58Deer Lagoon2
2020-06-14 07:50Point No Point1
2020-07-07 07:50Sea Ranch1
2020-06-14 11:25Joseph Whidbey SP5
2020-06-14 11:00Hastie Lake Rd beach access2
2020-06-14 10:35Libbey Beach County Park1
2020-06-10 09:00Lake Terrell1
2020-06-30 11:50Point Arena Lighthouse area35
2020-07-03 11:20Smith Island1
2020-07-02 19:12Vista Pt.--south of Bruhel Point3
2020-07-02 13:45Van Damme SP- Beach1
2020-06-13 15:07Noyo Headlands Park1
2020-06-14 06:15Usal Beach Campground1
2020-06-19 13:19Cattle Point1
2020-06-14 05:50Jamestown Beach3
2020-07-03 16:57Dungeness NWR1
2020-06-21 07:30Dungeness Recreation Area1
2020-07-06 06:31Stone Lagoon--north1
2020-06-27 10:45Luffenholtz Beach County Park60
2020-07-06 16:03Trinidad Harbor1
2020-06-24 16:46Trinidad Head1
2020-07-05 11:00Trinidad SB--Elk Head1
2020-07-01 19:17Enderts Beach Rd.2
2020-06-16 10:55Humboldt Bay--King Salmon1
2020-06-17 18:10North Spit--Coast Guard Cove1
2020-06-15 14:57Humboldt Bay--North Spit jetty2
2020-06-27 17:04Crescent City Harbor--Battery Point Lighthouse1
2020-06-21 09:55Bob Straub SP2
2020-07-09 07:00Roads End SP10
2020-07-01 06:15Siletz Bay--Salishan Nature Trail1
2020-07-09 06:25D River Beach Wayside7
2020-07-04 09:20Tokatee Klootchman SP1
2020-07-03 10:45Bray Pt.2
2020-06-29 07:55Siuslaw River--North Jetty3
2020-07-02 12:15Siuslaw River--South Jetty (jetty only)2
2020-07-09 15:21Bob Creek Wayside3
2020-07-03 12:51Bayocean Spit--ocean (west) side30
2020-07-03 08:42Siltcoos River Beach and Parking Area22
2020-07-09 11:14Smelt Sands SP & 804 Trail (north of Adobe)1
2020-07-04 09:00Nehalem Bay SP2
2020-07-09 13:35Manzanita2
2020-06-14 08:41Fishing Rock1
2020-06-25 10:10Harris Beach SP--Day Use Area1
2020-07-09 09:04Manzanita Beach2
2020-07-03 08:30Neahkahnie Mt. Wayfinding Point3
2020-06-11 09:40Race Rocks6
2020-07-09 07:16Del Rey Beach45
2020-07-09 10:18Haystack Rock1
2020-07-09 07:46Sunset Beach Recreation Area5
2020-07-09 15:20Fort Stevens SP--South Jetty/Parking Area C2
2020-06-26 06:54East Sooke Regional Park--Beechey Head1
2020-06-13 17:40Coquille River--North Jetty1
2020-06-26 07:40Face Rock Wayside1
2020-06-26 14:45Twin Harbors SP--beach access1
2020-06-17 10:00Olympic NP--Kalaloch1
2020-06-13 09:00SeaSide Escape Retreat, Douglas Bay17
2020-06-30 19:32Powell River--Gibson's Beach2
2020-06-30 08:41Deep Bay3
2020-07-04 14:20Oyster Bay3
2020-06-12 11:25Campbell River--Tyee Spit2
2020-06-19 19:50Ucluelet--Amphitrite Point2
2020-06-18 13:40Ucluelet--Big Beach1
2020-07-06 11:10Pacific Rim National Park--Wickaninnish Beach6
2020-07-03 07:30Malcolm Island--Kaleva Road29
2020-06-14 08:30MK Bay Marina1
2020-06-15 15:45Alaska Highway--km 887 lake2
2020-06-20 06:50Ketchikan (town)1
2020-07-01 15:15Holkham Bay (@ Tracy Arm off of Stephens Passage)5
2020-06-12 14:13Eagle Beach SRA1
2020-06-13 09:55Gustavus--Forelands1
2020-06-17 06:20Tetlin NWR--Highway Lake (MP F293.4 AK Hwy)2
2020-06-17 08:12Tetlin NWR--Deadman Lake (MP F268.7 AK Hwy)1
2020-06-24 20:30Tetlin NWR--Yarger Lake (MP F261.3 AK Hwy)2
2020-07-04 07:00Wrangell-St. Elias NP--Kendesnii Campground1
2020-07-07 18:49Middleton Island (restricted)--Sea Lion point1
2020-06-14 11:46Bolio Lake & Burn (MP 2 Meadows Rd)(Restricted Access)1
2020-06-24 08:24Denali Hwy--Tangle Lakes to MacClaren Summit (MP P21.5-P36.8)2
2020-06-29 13:51Whittier (town)2
2020-06-14 07:56Resurrection Bay (Seward)1
2020-07-03 13:00Wasilla--Wasilla Lake1
2020-06-16 19:48Goose Lake1
2020-07-03 17:19Connors Lake2
2020-06-12 07:00Denali SP--Byers Lake1
2020-07-08 10:43Homer--Eagle Lake2
2020-06-21 06:25Kenai--Tarbox Wildlife Viewing Platform1
2020-06-30 11:48Anchor Point--Anchor River Mouth1
2020-06-25 18:20Deadhorse--East Lake Drive8
2020-06-26 11:00Deadhorse (town) (MP D0 Dalton Hwy)8
2020-06-30 14:15Franklin Bluffs to Sagwon Bluffs (MP D37.7-MP D64.5 Dalton Hwy)1
2020-06-23 18:52Prudhoe Bay--Seawater Treatment Plant, Point McIntyre18
2020-07-02 19:57Utqiagvik (Barrow)--Emaiksoun Lake1
2020-06-29 18:15Solomon (Nome-Council Rd.)2
2020-06-29 16:40Cape Nome1