Black Guillemot
Black GuillemotBlack GuillemotBlack GuillemotBlack Guillemot

Black Guillemot

Cepphus grylle

Least ConcernNear ThreatenedVulnerableEndangeredCritically Endangered
30–40% · Possible
overall probability at Acadia National Park
4,367 Verified records at Acadia National Park
December Best month highest sighting rate
☀️ Diurnal When it's active during daytime hours (6am–6pm)

The black guillemot or tystie (Cepphus grylle) is a medium-sized seabird of the Alcidae family, native throughout northern Atlantic coasts and eastern North American coasts. It is resident in much of its range, but large populations from the high arctic migrate southwards in winter. The bird can be seen in and around its breeding habitat of rocky shores, cliffs and islands in single or smalls groups of pairs. They feed mainly by diving towards the sea floor feeding on fish, crustaceans or other benthic invertebrates. They are listed on the IUCN red list as a species of least concern. Both sexes have very similar appearances with black plumage and a large white patch on the upper side of their wings in summer. Wikipedia →

30–40% of wildlife watchers report a Black Guillemot sighting in Acadia National Park, based on 4,367 days of visitor records from GBIF citizen-science data.

Closest Relatives at Acadia National Park

Razorbill
LC

Razorbill

☀️ Diurnal Bird

Alca torda

<5% · Rare
Atlantic Puffin

Atlantic Puffin

☀️ Diurnal Bird

Fratercula arctica

<5% · Rare
Common Murre
LC

Common Murre

☀️ Diurnal Bird

Uria aalge

<5% · Rare
Thick-billed Murre
LC

Thick-billed Murre

☀️🌙 Day & Night Bird

Uria lomvia

<5% · Rare
Dovekie
LC

Dovekie

☀️ Diurnal Bird

Alle alle

<5% · Rare
American Herring Gull
LC

American Herring Gull

☀️ Diurnal Bird

Larus smithsonianus

70–80% · Very likely
Great Black-backed Gull
LC

Great Black-backed Gull

☀️ Diurnal Bird

Larus marinus

40–50% · Likely
Ring-billed Gull
LC

Ring-billed Gull

☀️ Diurnal Bird

Larus delawarensis

20–30% · Possible
Laughing Gull
LC

Laughing Gull

☀️ Diurnal Bird

Leucophaeus atricilla

10–20% · With luck
Common Tern
LC

Common Tern

☀️ Diurnal Bird

Sterna hirundo

10–20% · With luck
Spotted Sandpiper
LC

Spotted Sandpiper

☀️ Diurnal Bird

Actitis macularius

5–10% · With luck
Greater Yellowlegs
NT

Greater Yellowlegs

☀️ Diurnal Bird

Tringa melanoleuca

5–10% · With luck

📅 Monthly Probability

40–50
Jan
30–40
Feb
30–40
Mar
10–20
Apr
20–30
May
30–40
Jun
30–40
Jul
40–50
Aug
40–50
Sep
40–50
Oct
40–50
Nov
50–60
Dec

☀️ When They're Spotted

Most active during daytime hours (6am–6pm) · across all parks (global)

☀️Diurnal
☀️🌙🌙12am6am12pm6pm12am

Global Distribution

Where this species is recorded worldwide. Restricted to human observations from 2019 onwards — the same kind of record and the same period the probabilities on this page are built from, so collar-tracking studies, camera-trap arrays and museum specimens are excluded. Around Santa Rosa that removes 5,924 GPS fixes from a handful of tagged jaguars.

where this species is recorded (GBIF density — it tracks where observers go, not how likely a sighting is)  ·  parks where it occurs — tap a pin for the sighting probability there

Parks Where Found

# Park Country Probability
1 Acadia National Park 🇺🇸 United States
30–40%
2 Vatnajokull National Park 🇮🇸 Iceland
30–40%
3 Cape Breton Highlands National Park 🇨🇦 Canada
30–40%
4 Gros Morne National Park 🇨🇦 Canada
5–10%
5 Wadden Sea National Park 🇩🇪 Germany
<5%
6 Snowdonia National Park 🇬🇧 United Kingdom
Insufficient data
7 Cairngorms National Park 🇬🇧 United Kingdom
Insufficient data

Quick answers

What are the chances of seeing a Black Guillemot in Acadia National Park?

About 37% of wildlife watchers report a Black Guillemot sighting in Acadia National Park, based on 4,367 days of visitor records from GBIF citizen-science data.

When is the best time to see Black Guillemot in Acadia National Park?

December has the highest sighting rate for Black Guillemot in Acadia National Park in our monthly data.

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