The Jim Henson Company has started production on season four of its hit preschool series Dinosaur Train.

The new season (10 x half hours or 20 x 11 minutes) will air on PBS KIDS, where the show ranks as one of the top programs among kids ages two to five.

Season four of the CG-animated series focuses on themes of biodiversity and social diversity, and how both are necessary for a balanced life on Earth.

Dinosaur Train has now been sold to more than 175 countries, to broadcast heavyweights including TVO and TFO (Canada), Nickelodeon (the UK), Disney Channel (Germany), France 5 (France), RTVE Clan (Spain), SVT (Sweden), NRK (Norway), YLE (Finland), Canal+ (Poland) and Channel 1 (Russia).

In addition to the TV series, there is also the Prix Jeunesse Award award-winning Dinosaur Train website and a growing consumer products program, which recently expanded in Europe and Russia.

Dinosaur Train airs daily on PBS KIDS in the US, and is produced by The Jim Henson Company and Singapore-based prodco Sparky Animation, with the assistance of the Singapore Media Development Authority.