Conservationists at ZSL Whipsnade Zoo are celebrating after one of the world’s most endangered spider species had a boost in numbers.

Herts Advertiser: Endangered spiders hatch at ZSL Whipsnade Zoo. Picture: ZSLEndangered spiders hatch at ZSL Whipsnade Zoo. Picture: ZSL (Image: Archant)

Approximately 100 endangered Desertas wolf spiderlings hatched on 21 May.

The success follows two years of careful planning, in which conservationists found a dark cellar at the zoo to be the ideal environment for the species to breed. It is only the second time the species has been bred in captivity anywhere in the world.

Herts Advertiser: Endangered spiders hatch at ZSL Whipsnade Zoo. Picture: ZSLEndangered spiders hatch at ZSL Whipsnade Zoo. Picture: ZSL (Image: Archant)

The large, grey spiders, native to Desertas Grande Island in Madeira, only breed once or twice in their lifetimes.

Zookeeper Tyrone Capel said: "It has been fantastic to see these spiderlings hatch, and after two weeks clinging onto their mother's back, climb off her to go their own way.

Herts Advertiser: Endangered spiders hatch at ZSL Whipsnade Zoo. Picture: ZSLEndangered spiders hatch at ZSL Whipsnade Zoo. Picture: ZSL (Image: Archant)

"With a healthy population here at ZSL, we can continue to contribute to vital conservation research into one of the world's most endangered arachnids."

Herts Advertiser: Endangered spiders hatch at ZSL Whipsnade Zoo. Picture: ZSLEndangered spiders hatch at ZSL Whipsnade Zoo. Picture: ZSL (Image: Archant)