There are many pigeon traps on the market that allow pigeons to be trapped should they become a problem. Most of the traps work in the same manner as the one pictured below.
The exception would be the bars are placed onto a wire cage and not a pigeon loft.
Pigeons are fairly easy to trap once they get accustomed to eating in one area.
This picture shows the front of the trap.
The pigeon jumps in from this side of the trap
When the pigeon has entered the trap.
The two bars can be locked into place.
this allows the Countermark to be removed,
and the pigeon can be clocked.
The Bars can left unlocked and the pigeon
can enter the loft from the trap without any problems.
The bars will drop back into place
and the pigeons is now trapped in the loft