I introduced the lesson with the Jump Start "Echolocation" music video ( https://www.youtube.com/watch?v=Hr-Y2Tt8gFE ). The students loved the song and it really helped them understand the topic. The lesson goes along with the fourth grade standard - 4-LS1-2 Use a model to describe that animals receive different types of information through their senses, process the information in their brain, and respond to the information in different ways.
It is a fun lesson/activity but it will definitely test your classroom management skills. The students get a lot out of it though and it is very beneficial.