Yep, I have them too and I don't have any other version of perl installed other than the Cygwin one:
$ perl -V
Summary of my perl5 (revision 5 version 10 subversion 1) configuration
+:
Platform:
osname=cygwin, osvers=1.7.5(0.22553), archname=i686-cygwin-thread-
+multi-64int
uname='cygwin_nt-5.1 reini 1.7.5(0.22553) 2010-04-12 19:07 i686 cy
+gwin '
Built under cygwin
Compiled at Aug 28 2010 20:17:29
%ENV:
CYGWIN=""
@INC:
/usr/lib/perl5/5.10/i686-cygwin
/usr/lib/perl5/5.10
/usr/lib/perl5/site_perl/5.10/i686-cygwin
/usr/lib/perl5/site_perl/5.10
/usr/lib/perl5/vendor_perl/5.10/i686-cygwin
/usr/lib/perl5/vendor_perl/5.10
/usr/lib/perl5/vendor_perl/5.10
/usr/lib/perl5/site_perl/5.8
/usr/lib/perl5/vendor_perl/5.8
.