In subsequent citations, only use the first author's last name followed by et al. in the signal phrase or in parentheses. (Kernis et al., 1993). In et al. , et should not be followed by a period.
Transcript of Hammerhead Shark Eyes. Structure of Eye. The structure of a hammerhead sharks eye is very similar to the human eye, they have a cornea, lens, retina, pupil and iris. Their retina has both cone and rod cells, which means they can see light, dark, and colours.
Diving with Hammerhead Sharks. Hammerheads are aggressive hunters, however they do not actively seek out human prey. They are however very defensive and will attack if provoked. Generally speaking humans have nothing to fear from hammerheads although on rare occasions larger sharks have attacked people.