From land some rocks and small hills might look insignificant from the top but below they play a crucial role. These rocks force deep ocean currents to the top bringing with them many nutrients and with them, hungry fellows start arriving. This is the gatherings of Hammerhead sharks in Costa Rica in BBC Earth
Channels: Ecology
Tags: Gatherings of Hammerhead sharks in Costa Rica BBC Earth
Uploaded by: benco ( Send Message ) on 26-11-2011.
Duration: 3m 47s