Caspian Tern
Hydroprogne caspia
- KingdomAnimalia (Animals)
- PhylumChordata (Cordats)
- ClassAves (Aus)
- OrderCharadriiformes (Caradriformes)
- FamilyLaridae (Gulls, Terns, and Skimmers)
- GenusHydroprogne (Caspian Terns)
- SpeciesHydroprogne caspia (Caspian Tern)
Closest Relatives at Olympic National Park
Glaucous-winged Gull
Larus glaucescens
California Gull
Larus californicus
Short-billed Gull
Larus brachyrhynchus
Heermann's Gull
Larus heermanni
Western Gull
Larus occidentalis
Ring-billed Gull
Larus delawarensis
Iceland Gull
Larus glaucoides
Bonaparte's Gull
Chroicocephalus philadelphia
American Herring Gull
Larus smithsonianus
Black-legged Kittiwake
Rissa tridactyla
Sabine's Gull
Xema sabini
Common Tern
Sterna hirundo
📅 Monthly Probability
☀️ When They're Spotted
Most active during daytime hours (6am–6pm) · across all parks (global)
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
Quick answers
What are the chances of seeing a Caspian Tern in Olympic National Park?
About 3% of visitor-days record a Caspian Tern sighting in Olympic National Park, based on 1356 observer-days of citizen-science data from GBIF.
When is the best time to see Caspian Tern in Olympic National Park?
May has the highest sighting rate for Caspian Tern in Olympic National Park in our monthly data.