Baltimore Maryland is one place where you can go to see this extrodinary event. The beaches littered with horseshoe crabs laying their eggs and the shorebirds following them eating their fill to gain necessary wieght to continue their journey to their breeding grounds.

Here’s a link to  see a picture of these ancient creatures doing what they do best  and view an article from the Baltimore Sun on this years horseshoe crab migration.

The female horseshoe crab, with a male horseshoe crab in tow will come up to the shore line and lay up to 20,000 eggs in a number of shallow nests that she makes along the beach.

After laying the eggs she pulls the male over the nest when he then fertilizes the eggs.

It’s a good thing that she lays so many eggs because they then leave the nest unattended and the eggs are then open for predators to eat, mainly shorebirds.

Typically it is estimated that only 1/10 of 1 percent of the eggs will end up surviving to adult hood. With this dismal chance of survival it’s a good strategy that they lay so many eggs.

In all but the warmer climates horseshoe crabs will only mate once a year. This being in late spring to early summer.

Down here in Florida they mate pretty much year round except in mid winter when they bury themselves in the sand for a couple of months till things warm up a bit.