Wadden Sea Tidal Harbour Seals
Wadden Sea UNESCO Coast, Friesland, Netherlands · Europe · wetland_coast
About this place
Track Wadden Sea semidiurnal mudflat dynamics, Phoca vitulina haul-out thermoregulation, and mammalian dive bradycardia.
For kids: Explore a magical sea floor that dries out twice a day so spotted seals can curl into sunny banana poses!
Wadden Sea Tidal Harbour Seals · 360° Habitat Camp
What to look for
- Low-tide seal sandbar — Phoca vitulina thermoregulatory posture. Locate the emergent intertidal sandbar used for haul-out thermoregulation
- Turbid flounder tidal channel — Vibrissal hydrodynamic wake tracking. Centre the turbid tidal gully where seals track benthic flatfish wakes
- Diatom mudflat shorebird table — East Atlantic Flyway benthic refuelling. Scan the exposed intertidal mudflat supporting East Atlantic Flyway shorebirds
Source: Reijnders et al. (2010) & Dehnhardt et al. (2001), Science — Wadden Sea Phoca vitulina haul-out energetics and hydrodynamic whisker trail-following.
Ask together: Why do you think a wet seal lifts both its nose and its back flippers up into the air like a curved yellow banana on damp sand?
Field quiz
Kids' question: How does a harbour seal find hiding fish when murky tidal water makes it hard to see?
- Wavy super-sensitive whiskers that feel invisible water trails
- Glowing flashlights on the tips of its flippers
- Asking passing seagulls to point downward
Answer
Wavy super-sensitive whiskers that feel invisible water trails
Adults' question: What cardiovascular reflex enables Phoca vitulina to forage underwater on minimal oxygen stores?
- Pronounced dive bradycardia slowing heart rate below ten beats per minute with peripheral vasoconstriction
- Absorbing dissolved oxygen directly through flipper skin
- Inflating buoyant air sacs inside hollow rib bones
- Switching brain neurons to zero-energy dormancy mid-chase
Answer
Pronounced dive bradycardia slowing heart rate below ten beats per minute with peripheral vasoconstriction
360° photo: DerMische, CC BY-SA 4.0
See it live: Live check: Dutch Wadden Sea Harbour & Grey Seal Watch
- By day
- Harbour seals in banana poses, Atlantic grey seals & oystercatchers Harbour seal pups shed their white lanugo coat in utero, allowing them to swim alongside mothers on the very first rising tide after birth.
- By night
- Resting seals shifting with rising tides & nocturnal curlew calls Lunar semidiurnal tides dictate seal haul-out schedules regardless of solar time, triggering nocturnal foraging bouts across Wadden channels.
Other language: Русский