‘These birds are telling us something serious is happening’: the fading song of the marsh tit

ichard Broughton has been nosing around this neighbourhood for 22 years. He gossips about inhabitants past and present, reeling off information about their relationship status, openness to visitors, brawls and neighbourly disputes. “They used to have a big punch up in spring here,” he says, pointing out where one family’s territory ends and the next begins.

Broughton’s domain is not a city block but an ancient woodland called Monks Wood, in Cambridgeshire. The inhabitants are marsh tits: tiny songbirds, each weighing about the same as two sheets of A4 paper.Broughton holds up an old Nokia phone and plays a warning call. The bird he’s searching for is a kind of avian Hugh Hefner: nine years old in May and currently hitched up with a one-year-old. He quickly comes to inspect Broughton.

By 2042 the population is projected to be zero. “We know what’s coming. Within my lifetime they will probably disappear. It can be distressing to watch because you get to know their lives and relationships,” says Broughton.The decline of these birds is a case study in how increasing human activity can drive a species toward extinction. Their dwindling numbers are partly driven by growing competition from blue tits and great tits, which are benefiting from being fed by humans in their gardens .

This woodland is a small island of suitable habitat surrounded by intensively farmed arable land. Marsh tits will not fly over open farmland, they only follow hedges and woodlands, so this population is becoming increasingly isolated and incestuous.When Broughton first came to the wood in 1999 there were nightingales, willow tits, hawfinches and lesser-spotted woodpeckers. ‘Now they’ve all gone,’ he says.

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