Removing birds from chimney

if you don't have a screen on the top of your flue (and it would seem you don't), try this.

Light a propane torch and set in the fireplace (with the damper open of course). Flue will get warm enough that the birds will move.

Immediately after you do this put a screen on the top of your flue or the birds will return.

Chimney swifts are federally protected by the Migratory Bird Act. There are likely nestlings in your chimney... consider allowing them to fledge, then clean out and cap your chimney at the end of the summer.

Light a fire in your fireplace.