Bonnethead fish control pitching (up-and-down motion of the body), yawing (the side-to-side motion), and rolling. Most hammerhead sharks do not yaw or roll and achieve pitch using their cephalofoils. The smaller cephalofoil of a bonnethead shark is not as successful, so they have to rely on the combination of cephalofoils and their large pectoral fins for most of their motility. Compared to other hammerheads, bonnethead sharks have larger and more developed pectoral fins and are the only species of hammerhead to actively use pectoral fins for swimming. Using data from mtDNA analysis, scientist have found that evolution of hammerhead sharks probably
Creature in the Teacher Creature in the Teacher Creature in the Teacher is the 13th book in the Spooksville series. In the UK it is named "Alien Invasion!" Adam, Sally, Watch and the gang can't wait for the first day of school. Though, their new science teacher, Mr. Snakol, is "very" weird. Later in the day, everyone starts to think that he's an alien. Soon Sally goes missing and their suspicious grow. When the gang goes deeper into school grounds, they find out Mr. Snakol "is" an alien! Now the kids MUST find a way to stop him. What can a few kids do