Crocodiles can smell and detect period blood as the crocodile has a very highly developed sense of smell.
Discarding scraps in the water may attract crocodiles.
Feeding other aquatic wildlife such as ducks, fish and turtles also can attract crocodiles by attracting potential prey animals.
A crocodile cannot breed with an alligator because despite having a similar appearance the crocodile and alligator are genetically too different and although they are related they long ago diverged into different genera.
Also Alligators and Crocodiles belong to different subspecies (Alligatoridae and Crocodylidae).
The genetic differences between Alligators and Crocodiles make it impossible for them to have progeny.
A crocodile has a bite force of 3,700 psi which is enough of a bite force to actually bite through steel.
Crocodiles have a very powerful bite force up up to 3,700 psi which is enough to bite through steel.
Although if a Crocodile got into a fight with a hippo the hippo would likely win the fight because the hippo is much bigger than the crocodile even though the crocodile has a much more powerful bite force.