2) The female Bears are starting to mature enough to breed, Snoopy the male was showing a lot of intreats in one of the females following her every move.
I believe all the Bears have been fully mature for a long while. Some(all?) of the females may also be on contraceptives, but even if not I think its unlikely they would breed successfully with the existing den arrangement and number of animals(both bears and others) altogether in one enclosure.