The next time you're looking for some videos of marine life or animal life, you need to check out OceanFootage.com and NatureFootage.com. Both sites actually offer stock footage for licensing, but the videos are available for viewing, so homeschoolers can easily use the site for educational purposes.
The videos on both sites are organized in a common sense format that makes finding footage on a particular animal quite simple. The sites are ideal resources if you happen to be using my favorite elementary science curriculum by Jeannie Fulbright, such as Swimming Creatures of the Fifth Day.
I'd imagine many children (and adults) would love just browsing through the site to watch all the amazing footage!