At RSPB Dungeness, one of the first signs of spring is a booming sound that carries far across the water.
Alarming as it might sound, this strange call is great news for the RSPB. It means Britain’s loudest bird, the bittern, has returned to breed at the reserve. Appropriately, the first mating call of 2018 was recorded just after Valentine’s Day.
Once extinct in the UK, bitterns have only been booming…