David and Jenny Heitler-Klevans are a husband-and-wife musical duo known as Two of a Kind. They met at Oberlin College in 1986 -- not long before Do Peterson, Kirk Van Scoyoc, and Gretchen Ludwig of Science Groove would get to know each other at the same school. What is it about Oberlin and science songs? Anyway, Two of a Kind has written several kid-oriented science songs, including the one shown below. (Notice the musician playing the frog at the start!) Their YouTube channel has additional videos of science-themed performances at school assemblies and the Philadelphia Zoo.