We use an HDMI cable and hook it my laptop to the TV usually. Occasionally we’ll use our projector if it is a rainy, dark Field Trip Friday. You could just use a computer or tablet to snuggle up together and watch as well.
Live videos and highlight videos of Polar Bears. They have more than just polar bears, and not all of their cameras are from natural habitats.
One zoo that I really want to mention for videos is Cincinnati Zoo & Botanical Gardens.