git@github.com:USERNAME/perl.git is only accessible to USERNAME (or
collaborators), git://github.com/USERNAME/perl.git is available to
everyone.
and the following information:
http://github.com/USERNAME/perl/tree/orange
- git@github.com:USERNAME/perl.git branch orange
+ git://github.com/USERNAME/perl.git branch orange
=head1 Merging from a branch via GitHub