You might not like the picture above.
You can see how these gackos can be a big predator in your BH.
If you allow them to be in your BH they will not only clean all the baby birds but also the nests and the eggs.
They breed on anything that is alive that they can swallow whole piece.
This include insects (when small size), frogs, rats, snakes, birds and many others.
Have a good look on some species that can grow up to 10kg each.
A whooper and can you imagine what will happen if one of these creature happened to enter your BH? Your BH will be empty in a very short time.
If you enter a BH and sees lots of young baby birds on your BH floor, you can safely predict that there is a gacko in your BH.
There will be also signs of nests being half eaten.
You need to search for this animal and catch it.
The best is to set those traps using PVC pipe with one end capped off.
One opening to be opened but with a cap ready to be used if they enter to hide themselves.
Place about four to six on each floor and when their are signs of it inside the BH start searching for them. Once located chase them so that they will run towards the PVC traps.
The moment they entered to hide you close the opening and remove the tokek.