To earn their Girl Scout Bronze Award four years ago, Rhiannon Tomtishen and Madison Vorva set out to study orangutans.

Instead, they wound up investigating Thin Mints, Trefoils and Samoas.

What they uncovered soured them on the sweets and has put the Michigan teens at odds with Girl Scouts of the USA. Now they're on a march to change the recipe for Girl Scout cookies.

Their target: palm oil, which can come from places the primates live.

The girls, who have been scouts since they were five, have rallied troops across the country. Scouts sold 198 million boxes of cookies last year, but now some say they're done. Scouts and leaders have criticized their nonprofit organization on Facebook and Twitter.