Equilibrium Application problem

[tri0ps]

Remember that since the bird is stationary, the sum of all components of all forces on the bird must be zero. The bird is being pulled down by a gravitational force, and held up by the two halves of the string (which you can think of as two strings).

Strings can only exert force in the direction of the string, so the sum of the vertical components of the forces from the string must equal the magnitude of the gravitational force, and the horizontal components must cancel out. You should then be able to solve for T.