This 20 March 2020 video, recorded in Cuba, says about itself:
Swarm of Crab Mothers Cross Traffic to Lay Thousands of Eggs
An army of red land crabs migrates miles as some mothers prepare to lay up to 80,000 eggs apiece.
This May 2017 video says about itself:
Cuba: Crabs invade Bay of Pigs showing US how it’s done
Millions of crabs have invaded Cuba’s Bay of Pigs (Playa Giron), as shown by footage filmed on Wednesday.
The red, yellow and black crabs are undertaking their annual spring migration from the forest to the sea, where they aim to release their eggs.