Luke 12:27

“Consider the flowers, how they grow, they toil not, neither do they spin, yet I say to you, Even Solomon in all his glory was not arrayed like one of these.”

A second illustration is given as to clothing. The gorgeous flowers of the field grow beautiful without a lot of toiling and spinning, and yet they even outmatch the glory of the supremely wealthy Solomon. The warning here is against excessive effort like that required to make rich fabrics. To those who follow Him that should be spurned. They should be satisfied with the basics and with looking to God. They should not be wasting their effort on such things.

It may be intentional that the birds are male and the flowers female, the point being that His strictures apply to both.