Sandwich Tern
Sandwich TernSandwich TernSandwich TernSandwich Tern

Sandwich Tern

Thalasseus sandvicensis

5–10% · With luck
overall probability at Snowdonia National Park
114 Verified records at Snowdonia National Park
April Best month highest sighting rate
☀️ Diurnal When it's active during daytime hours (6am–6pm)

The Sandwich tern (Thalasseus sandvicensis) is a tern in the family Laridae. It is very closely related to the lesser crested tern (T. bengalensis), Chinese crested tern (T. bernsteini), Cabot's tern (T. acuflavidus), and elegant tern (T. elegans) and has been known to interbreed with both elegant and lesser crested terns. It breeds in the Palearctic from Europe to the Caspian Sea, and winters in the Mediterranean and on the coasts of Africa, India, and Sri Lanka. The Sandwich tern is a medium-large tern with pale silvery-grey upperparts, white underparts, a yellow-tipped black bill, and a shaggy black crest which becomes less extensive in winter with a white crown. Young birds bear grey and blackish scalloped plumage on their backs and wings. It is a vocal bird. Wikipedia →

5–10% of wildlife watchers report a Sandwich Tern sighting in Snowdonia National Park, based on 114 days of visitor records from GBIF citizen-science data.

Closest Relatives at Snowdonia National Park

European Herring Gull
LC

European Herring Gull

🌅 Crepuscular Bird

Larus argentatus

70–80% · Very likely
Black-headed Gull

Black-headed Gull

☀️ Diurnal Bird

Chroicocephalus ridibundus

30–40% · Possible
Lesser Black-backed Gull
LC

Lesser Black-backed Gull

☀️ Diurnal Bird

Larus fuscus

20–30% · Possible
Great Black-backed Gull
LC

Great Black-backed Gull

☀️ Diurnal Bird

Larus marinus

20–30% · Possible
Common Gull
LC

Common Gull

☀️ Diurnal Bird

Larus canus

10–20% · With luck
Iceland Gull
LC

Iceland Gull

☀️ Diurnal Bird

Larus glaucoides

Insufficient data
Mediterranean Gull

Mediterranean Gull

Bird

Ichthyaetus melanocephalus

<5% · Rare
Common Tern
LC

Common Tern

☀️ Diurnal Bird

Sterna hirundo

<5% · Rare
Black-legged Kittiwake
VU

Black-legged Kittiwake

☀️ Diurnal Bird

Rissa tridactyla

<5% · Rare
Arctic Tern
LC

Arctic Tern

☀️ Diurnal Bird

Sterna paradisaea

<5% · Rare
Little Tern
LC

Little Tern

☀️ Diurnal Bird

Sternula albifrons

Insufficient data
Little Gull
LC

Little Gull

☀️ Diurnal Bird

Hydrocoloeus minutus

Insufficient data

📅 Monthly Probability

<5
Jan
<5
Feb
<5
Mar
20–30
Apr
5–10
May
<5
Jun
5–10
Jul
10–20
Aug
5–10
Sep
<5
Oct
<5
Nov
<5
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 Ría Lagartos Biosphere Reserve 🇲🇽 Mexico
50–60%
2 Celestún Biosphere Reserve 🇲🇽 Mexico
40–50%
3 Paracas National Reserve 🇵🇪 Peru
20–30%
4 Península Valdés 🇦🇷 Argentina
20–30%
5 Namib-Naukluft National Park 🇳🇦 Namibia
10–20%
6 Wadden Sea National Park 🇩🇪 Germany
10–20%
7 Las Baulas Marine National Park 🇨🇷 Costa Rica
10–20%
8 Jaragua National Park 🇩🇴 Dominican Republic
10–20%
9 Table Mountain National Park 🇿🇦 South Africa
5–10%
10 Tayrona National Natural Park 🇨🇴 Colombia
5–10%
11 Snowdonia National Park 🇬🇧 United Kingdom
5–10%
12 iSimangaliso Wetland Park 🇿🇦 South Africa
5–10%
13 Garden Route National Park 🇿🇦 South Africa
5–10%
14 Los Haitises National Park 🇩🇴 Dominican Republic
5–10%
15 Biotopo Cerro Cahuí 🇬🇹 Guatemala
5–10%
16 Arrecifes de Cozumel National Park 🇲🇽 Mexico
5–10%
17 La Amistad International Park (Panama) 🇵🇦 Panama
5–10%
18 Sian Ka'an Biosphere Reserve 🇲🇽 Mexico
5–10%
19 Bastimentos Island National Marine Park 🇵🇦 Panama
<5%
20 Doñana National Park 🇪🇸 Spain
<5%
21 Marino Ballena National Park 🇨🇷 Costa Rica
<5%
22 Coiba National Park 🇵🇦 Panama
<5%
23 Piedras Blancas National Park 🇨🇷 Costa Rica
<5%
24 Ostional Wildlife Refuge 🇨🇷 Costa Rica
<5%
25 Tortuguero National Park 🇨🇷 Costa Rica
<5%
26 Corcovado National Park 🇨🇷 Costa Rica
<5%
27 Santa Rosa National Park 🇨🇷 Costa Rica
<5%
28 Addo Elephant National Park 🇿🇦 South Africa
<5%
29 Cabo Blanco Absolute Nature Reserve 🇨🇷 Costa Rica
<5%
30 Machalilla National Park 🇪🇨 Ecuador
<5%
31 Darién National Park 🇵🇦 Panama
<5%
32 Ciénaga de Zapata 🇨🇺 Cuba
<5%
33 Everglades National Park 🇺🇸 United States
<5%
34 Soberanía National Park 🇵🇦 Panama
<5%
35 Gandoca-Manzanillo Wildlife Refuge 🇨🇷 Costa Rica
<5%
36 Big Cypress National Preserve 🇺🇸 United States
<5%
37 Fertő-Hanság National Park 🇭🇺 Hungary
<5%
38 Carara National Park 🇨🇷 Costa Rica
<5%
39 Pyrénées National Park 🇫🇷 France
<5%
40 Main Ridge Forest Reserve 🇹🇹 Trinidad and Tobago
Insufficient data
41 Biebrza National Park 🇵🇱 Poland
Insufficient data
42 Utría National Natural Park 🇨🇴 Colombia
Insufficient data
43 San Lorenzo Protected Forest 🇵🇦 Panama
Insufficient data
44 Cahuita National Park 🇨🇷 Costa Rica
Insufficient data
45 Henri Pittier National Park 🇻🇪 Venezuela
Insufficient data
46 Manuel Antonio National Park 🇨🇷 Costa Rica
Insufficient data
47 Palo Verde National Park 🇨🇷 Costa Rica
Insufficient data
48 Białowieża National Park 🇵🇱 Poland
Insufficient data
49 Parque Natural Metropolitano 🇵🇦 Panama
Insufficient data
50 Yala National Park 🇱🇰 Sri Lanka
Insufficient data
51 Cairngorms National Park 🇬🇧 United Kingdom
Insufficient data

Quick answers

What are the chances of seeing a Sandwich Tern in Snowdonia National Park?

About 7% of wildlife watchers report a Sandwich Tern sighting in Snowdonia National Park, based on 114 days of visitor records from GBIF citizen-science data.

When is the best time to see Sandwich Tern in Snowdonia National Park?

April has the highest sighting rate for Sandwich Tern in Snowdonia National Park in our monthly data.

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