Most of us are unable to do anything large or media grabbing in respect to helping endangered animals. I prefer to help in a number of small ways.
I have gone vegetarian in protest of the way the meat and dairy industry mistreats their cows. I only eat free-range, organically-fed eggs in protest of the way the battery hens are treated. I boycott companies that use animal testing; write protest letters to labs, etc; donate money if I can to agencies that are trying to aid animals; boycott companies that deforest countries to obtain their wood; and, many other things.
There are many small ways you can help that will add up to become a major contribution. Look around and jump on every opportunity to help no matter how small.