They mention at least 3-4 times on the app how safe they are but I assure you it is laden with inappropriate behavior and explicit conversations. Players will 'teach' your child (under 10 years old) how to 'filter dodge' so they can have discussions and then 'sleep together' in their dens... which depicts animals jumping on one another while making comments about doing it faster or deeper etc... If you allow your children in this game, you will likely wake up one day and realize your child is a victim of sexual harassment/assault, etc.
Just google animal jam sexting and read reviews and look at a few you tube videos from your search - you will be shocked. I wish I had known this before my daughter was exposed.