Broadcast Outage: We're investigating a broadcast transmission failure affecting the San Luis Valley from Antonito in the south to Salida in the north. We're working to resolve this issue. You can stream our live broadcast HERE or via the RMPBS+ App.

Stream live and on-demand content now on our new app:

RMPBS+

Donate

Help tell more stories in 2026 - make a year-end gift!

Deep Look show's poster

Science and Nature

Once a Spawn a Time: Horseshoe Crabs Mob the Beach

See the unseen at the very edge of our visible world. Get a new perspective on our place in the universe and meet extraordinary new friends. Explore big scientific mysteries by going incredibly small.

Once a Spawn a Time: Horseshoe Crabs Mob the Beach

Season 8 Episode 14 | 4m 51s | CC

Horseshoe crabs may look scary, but when it’s springtime in Delaware Bay, millions of these arthropods show they’re lovers, not fighters. They lay masses of blue-green eggs up on the shore. At just the right time, they pop and release the larvae within to the sea.

share

Deep Look

Watch more episodes

These Swarming Locusts Are Grasshoppers Gone Wrong

They might look like harmless grasshoppers, but locusts have an appetite for destruction.

These Silk-Swinging Caterpillars Will Ruin Your Picnic

California oak moth caterpillars eat all the leaves on an oak. Will the tree survive?

These Mites Rain Down To Save Your Strawberries

Two tiny mites duke it out on strawberry plants throughout California.

Subscribe to Our Newsletters

Get trusted Colorado stories, programs, and events from Rocky Mountain PBS straight to your inbox.

Set Your Preferences >