The next time your kids are fighting, remember that while they may often pull apart, the most powerful instinct siblings have is to pull together. (csmonitor.com)
These are very powerful instincts that remain to this day in all cats - including yours. (2ndchance.info)
It's just another allusion to gut instinct — which, by the way, is one of the most powerful instincts around. (bookbrowse.com)