My 2 month old americanas will not roost on the 2 by 3 I have for them. I have one a out 18 in. off the floor and there staggered from there. For 2 nights I have sat them on the roost but they just fly down and roost by a small corner window where my dog sits and drools. I have a large window in front of their roosting poles also. What should I do?