As winter wanes, two romantic redbirds seal the deal with a sunflower seed as they form a partnership that will keep them busy through the summer, a bond that will yield handsome dividends for us all. With three broods yearly, they can produce a dozen of their kind, a 600% return. Add fine feathers, musical talent, and good family values - no wonder the cardinal interest rate continues to soar. Like to get in on the cardinal consortium? Put a birdfeeder in your backyard. You did? Congratulations! You are one smart investor.