On the eve of the Bananas in Pyjamas' 21st birthday, there's uncertainty about future seasons of the animated version of the original and hugely popular live-action series. The last of 156 episodes of the animated series will air on ABC2 on July 2.

The ABC's head of children's content, Tim Brooke-Hunt, said that even though the program is watched by an average of 380,000 viewers nationally, and is the public network's biggest-selling children's product on the international market, screening in about 130 countries, Bananas in Pyjamas does not generate enough revenue to justify a fourth season.

"At this stage, there are no plans to renew the series," Mr Brooke-Hunt said.

"It is a matter of money. Although we have been nicely treated by the government in the context of funding of our school-age channel, ABC3, the reality is that ABC4Kids (on ABC2), is funded from the previously existing, general allocation for the ABC."