The girls are playing with a bucket of plastic wild animal figures. From the other room I just heard this:
S6: When the rhinos want to mate, they put their horns together!
O5: When the giraffes want to mate, they put their necks together. Then they kiss, like this! mwah, mwah, mwah!
S6: When the cheetas want to mate, they run in opposite directions, really fast!!
O5: When the elephants want to mate, they throw water on each other!!!