[2] When threatened, the toad folds its limbs under its body, tucks its head in and tenses in a ball shape.

If on an incline (this is how it gets its name), this causes it to roll down the slope, escaping the attention of its predator, and looking like a dislodged pebble.

[3] Its natural habitats are rocks and peat bogs in montane tepui environments at elevations of 2,300–2,700 m (7,500–8,900 ft) asl.

It is classified as vulnerable because of its apparently restricted range.

[1] This toad was featured on a BBC series, Life, pursued by a tarantula spider.