India, Oct. 18 -- Giraffes tower over office-goers in London. Wildebeest trot beside monkeys in Denmark. Wolves and zebra parade through Venice.

Herds of life-sized animal puppets have been charging through city streets, as part of a public-art project that seeks to underline the urgency of the climate crisis.

The Herds and its 70 recycled-wood-and-cardboard puppets will keep going, over the coming months, in what they call their "stampede around the world".

Created by the UK-based not-for-profit public-art company The Walk Productions, they have visited 25 cities in 11 countries across Africa and Europe so far (Congo, Nigeria, Senegal, Morocco, Spain, France, Italy, the UK, Denmark, Sweden and Norway).

In each city, they transform sp...