An endemic and endangered South Island takahe on Tiritiri Matangi, a predator-free island in New Zealand.
Auckland, the largest city in the country, is in the background.
Zealandia is a sanctuary for native wildlife in the heart of Wellington, the New Zealand capital. An innovative predator-proof fence surrounds it.
Although they are free to fly away, New Zealand kaka are offered sugar water in Zealandia to incite them to nest inside the safe sanctuary.
In Helsinki (Finland), conservationists regularly restore gravel spawning beds for sea trouts.
In spring, conservationists count baby trouts ("fries") along the brooks.
Fry counting happens at night, when the fish rest near the shore.
Spawning beds are made of gravel of various sizes and surrounded by trees, which bring insects to the river when leaves fall.
Dams are obstacles for trouts coming back from the sea to spawn in brooks.
A gate used to monitor trout movements up or downstream.
To monitor trout populations, researchers capture fish with electrofishing gear.
A trout is scanned to identify the chip it was equipped with.
A researcher inspects a trout that was tagged with a chip.
When they are caught, trouts are measured, weighed then released.
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