Show:
History
Anatomy and Life Cycle
Medical Uses
Importance in the FW
Reason for Decline
100
How long have Horseshoe Crabs existed?
300 million years.
100
How many legs does the horseshoe crab have?
10
100
What does their protect them and us from?
Infections.
100
Which organisms compete for the horseshoe crab?
Grackle, Sanderling, Striped Bass and Loggerhead Turtle.
100
What species over hunted them for years?
Humans.
200
Are there more female or male crabs?
female.
200
Where is the mouth on the horseshoe crabs body?
on the bottom in between all of it's legs.
200
What is a horseshoe crab blood used in?
testing vaccines, contacts, medical equipment, and much more. 
200
Are Horseshoe crabs bottomfeeders?
yes.
200
What bird helps them?
Red Knots.
300

In 2003, a study found "blank" adult horseshoe crabs in Pleasant Bay?

half a million.

300
How many eggs to the female crabs lay?
60,000 to 120,000.
300
Does a horseshoe crab have a nose?
False.
300
true or false horseshoe crabs are extinct?
false
400
How many species of horseshoe crabs are there?


4.
400
How many times over 9 years do males molt?
16.
400

What part of the horseshoe crab is used for medical research?


Blood , Eyes,  Chitin or Shell, All of the Above 

400
Horseshoe crabs knew the dinosaurs?
false.
500

How old are the earliest species of horseshoe crabs?


300,000,000.
500
How many times do females molt over 11 years?
17.
500

True or False: Horseshoe crabs are more related to spiders than they are to actual crabs.

true
500
True or false. they are older than dinosaurs.
True