Taking the above statement literally would indicate birds should worry, which contrasts against scripture.
I tell you not to worry about your life. Don’t worry about having something to eat, drink, or wear. Isn’t life more than food or clothing? Look at the birds in the sky! They don’t plant or harvest. They don’t even store grain in barns. Yet your Father in heaven takes care of them. Aren’t you worth more than birds? Can worry make you live longer?
Taking the above statement at common usage would indicate (correctly and Biblically) that worry is…um…not of value.
Origin: Before the advent of cars, one could see and smell the emissions of horse-drawn wagons in New York. Since there was no way of controlling these emissions, they–or the undigested oats in them–served to nourish a large population of English sparrows. If you said that something was for the birds, you’re politely saying that it was horse manure.
So, make like a bird, and let worry take flight! And, remember…even though God will provide for us…life can’t be full of rose bushes without a little fertilizer along the way!