This video says about itself:
5 December 2014
… Video displays how it is swimming and waving his tail inside the egg.
Video is created by me, soundtrack is a classic song “Song of the Indian Guest” created by composer Nikolai Rimsky-Korsakov who died in 1908 (more than 100 years ago).
Translated from Dutch NOS TV today:
It is an egg of a small-spotted catshark, a small shark of about one meter long. The small-spotted catshark is common in the North Sea and the discovery of a shark’s egg is not so special, but a living embryo is.
“We sometimes find empty egg capsules on the beach, but I’ve never seen a live shark in an egg,” says Marijke Barhorst of the Visitors Centre of Schiermonnikoog National Park.
This vulture has a transmitter, showing it is originally from central France. Bearded vultures are very rare in the Netherlands.
I have been to Ameland and Schiermonnikoog, but I never saw any bearded vulture there. Though I did see them in Aragon in Spain.
New wetland for birds on Ameland: here.
Translated from BirdLife in the Netherlands:
Jan 26, 2016 – Brent geese preferably eat non salty salt marsh plants. Salty plants are avoided. The protein content of the plant apparently leaves the birds cold. That concludes PhD researcher Wimke Fokkema based on measurements of plants in the marshes of Schiermonnikoog island. The research is published this month in the journal Oikos.