Robert Irwin is facing a wave of online criticism after footage aired on national television showing a tense moment inside a crocodile enclosure at Australia Zoo, with some viewers calling for him to be cancelled over what they described as dangerous and irresponsible behaviour.

The clip, which aired during a Today segment featuring Robert and his mother Terri promoting the latest season of Crikey! It's the Irwins, showed Robert inside an enclosure with a crocodile named Casper. During the segment, Casper charged at Robert, who was heard yelling "bail, bail, bail!" as other keepers rushed in. The moment spread rapidly online and drew strong reactions from critics who argued the Irwins were putting both animals and people at risk for entertainment purposes.

"When will they learn? This is sad. For a show, was it worth it?" one commenter wrote. Others called for Robert to stop working with the animals altogether, with some arguing zoos should not exist at all.

Robert, however, was quick to address the footage and gave it a characteristically relaxed interpretation. "Safety for us is also crucial and you definitely have to know when to call it," he wrote on Instagram. "And with such a powerful and quick croc like Casper, we had no choice but to bail!"

Supporters were equally vocal in his defence. Many pointed out that the crocodile had been through similar demonstrations hundreds of times without incident, and that the Irwins have dedicated their lives to wildlife conservation rather than exploitation.

Robert grew up at Australia Zoo after losing his father Steve Irwin when he was just two years old. He has since become a wildlife ambassador in his own right, appearing in documentaries and television programmes while continuing the conservation work his father began. He recently shared a touching side-by-side video of himself and his father feeding the same crocodiles nearly 20 years apart.

His mother Terri has previously acknowledged the inherent unpredictability of working with crocodiles. "There are days where you cut it finer than other days," she said, "but I know that Robert's well-rehearsed with crocodiles." She added, laughing, that the same crocodiles who used to try to get to Steve now go after Robert in the same way.

The online backlash has not appeared to have had any lasting impact. Australia Zoo continues to operate, and Robert continues to post his wildlife content to a following that remains largely enthusiastic.