All the best. We love what you did here.
That would be a great sound to add - but unfortunately, although our 'Kids' are animals (and don't we just know it sometimes, as teachers!) they do not come into the category of 'African' animals, so I don't think that Katja and Gerda are likely to add their 'WOW' sound to the database?
Maybe, one day, I can come over to hear their WOW's for myself - I would love to meet your kids and talk to them about my experiences in Africa!