Perfect example of the propagation of ignorance ,,a person doest know A(in this case that the kangaroo uses its tail as a leg) so that automatically
means B (in this case that the video is cgi).
Any other evidence of CGI, Sherlock?
we will not be calling worldstage as a witness for the defense your honor.
also in the comments on Youtube, they say these two are probably Friends or even Brothers. Because their Back Claws can rip you apart.
so they are not fully fighting.