Evey - 7 months is when females can go into heat, then every 4 (?) weeks after that. Males flux a little.. sometimes younger (I had a boy who went through the change at 5 months, I have another boy who's nearly 8 months & still hasn't figured out that he's a boy).
Zuzu - Here, we do have a problem with bindweed and the Colorado Dept of Ag is trying a new way of controlling it. They've brought in a specific little moth that eats only bindweed from Asia, which seems to work because the bindweed we have here is from Asia. However, with as many different types of moths there are, how can we be assured that, once the bindweed is gone, the moths (rather the caterpillars) don't go for something else?
