I use videos all the time for Science and Social Studies. It helps to enhance the learning and activate prior knowledge for my ESL learners when they have trouble understanding me.
I used the two search links to find the two videos below.
1. Teacher Tube
Beautiful Birds-birds and their function
Planet Earth-Jungles: Birds of Paradise Display Male birds of paradise perform a balletic boogie to attract a mate.
These two videos would enhance our bird unit in second grade.