Bonnethead tend to be larger than males. The Greek word "sphyrna" translates as "hammer", referring to the shape of this shark's head; "tiburo" is the Taino word for shark. Bonnethead sharks are the only sharks known to exhibit sexual dimorphism in the morphology of the head. Adult females have a broadly rounded head, whereas males possess a distinct bulge along the anterior margin of the cephalofoil. This bulge is formed by the elongation of the rostral cartilages of the males at the onset of sexual maturity and corresponds temporally with the elongation of the clasper cartilages. The pectoral fins on most
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