Through the use of Google's augmented reality in search experiences I was able to make a digital rendering of platypus swim through our house. Here's a little video of the experience.
The augmented reality platypus was fun for a while, but my daughter still wanted to know what a platypus sounds like. For that, I just did search for "platypus sounds" on YouTube. This video had what I needed.
Kids who are older than my preschooler can learn a lot about how the biology of a platypus through a fascinating TED-Ed lesson titled A Year in the Life of One of Earth's Weirdest Animals.