What wildlife is on the beaches inside Manuel Antonio National Park?

More than most visitors notice — the shoreline is its own habitat, and the crabs alone are worth a slow ten minutes. Manuel Antonio is sold on monkeys and sloths, so almost everyone walks the trail, swims at Playa Manuel Antonio and leaves without looking down.

The park’s beaches sit inside the protected area, which is the reason this works at all. Playa Espadilla Sur and Playa Manuel Antonio are both within the boundary, and the rocky ends of each one hold tide pools that fill and drain twice a day. What lives there is small, visible and completely unbothered by people who stand still.

What are the bright red and purple crabs in Manuel Antonio?

Those are Halloween crabs — Gecarcinus quadratus — and they are the single most photogenic animal on the shoreline. Purple-black shell, orange legs, two yellow spots on the back. The name comes from the colour scheme, and once you have seen one you will spot them everywhere.

They are land crabs, not water crabs. They live in burrows in the soil behind the beach, among the leaf litter at the forest edge, and they come out to feed on fallen leaves. That is why you meet them on the trail as often as on the sand. They are most active in the wetter months and at dusk, which is one of the things a Manuel Antonio night tour shows you that a midday walk never will.

What other crabs will I see on the shoreline?

Three more, each in its own zone of the beach:

  • Sally Lightfoot crab (Grapsus grapsus) — flat, fast and mottled red, living on the wet black rock at the tide line. They scatter the moment you move, which is exactly how you find them.
  • Ghost crab (Ocypode) — pale, sand-coloured, with eyes on stalks. Digs the small holes you see across the dry sand above the waterline. Named for the way it vanishes.
  • Hermit crab — dragging a borrowed snail shell across the sand in slow motion. Common in the shaded strip where forest meets beach.

Fiddler crabs, with the one oversized claw, belong to the muddy edges rather than the open beach — those you meet on the Damas Island Mangrove Group Boat Tour at $55 per person, not inside the park.

Where are the tide pools in Manuel Antonio?

At the rocky ends of the beaches, especially around the base of Punta Catedral — the forested headland that separates Playa Espadilla Sur from Playa Manuel Antonio.

Punta Catedral was an island once; sediment built a natural land bridge, a tombolo, that joined it to the mainland and created the two beaches on either side. That geology is the reason the rock is there at all, and the rock is what makes the pools. The loop trail around the headland is where most people take their photos of the bay, and the pools sit below it.

What lives in the tide pools?

Small things, and you need to stand still to see them. Expect sea urchins wedged in crevices, small fish trapped by the falling tide, hermit crabs, sea snails and barnacles, and the Sally Lightfoot crabs working the wet rock above.

This is honest expectation-setting rather than a promise: a tide pool is not an aquarium. On a rough day or a high tide there is nothing to see at all. On a calm low tide it is one of the quietest, most rewarding ten minutes in the park.

What time should I go to see the tide pools?

At low tide — that is the whole answer, and it is worth checking the day’s tide chart before you plan the walk. A high tide covers the rock completely.

The good news is that low tide often overlaps the early morning window that already gives you the best wildlife on the trail. Going in at opening puts you on the trail while the animals are active and on the rocks before the midday heat. The reasoning is in the best time of day to see wildlife in Manuel Antonio.

Can I touch the animals or take shells home?

No on both counts. This is a national park: everything in it, including empty shells and rocks, stays where it is.

There is a practical reason beyond the rule. Empty snail shells are the housing supply for the hermit crab population — take a bagful home and you have removed homes from the beach. Handling animals from a tide pool stresses them, and urchin spines are a genuinely unpleasant way to end a holiday. Look, photograph, leave it.

Will the monkeys take my things on the beach?

They will try, and it is the most common bad surprise of a beach day here. White-faced capuchins work the beach at Playa Manuel Antonio and are entirely capable of opening a bag while you are in the water.

Keep food sealed and out of sight, never feed them, and do not leave a bag unattended on the sand. Feeding wildlife changes their behaviour and is prohibited in the park. Which species you are dealing with is worth knowing — the difference is explained in white-faced capuchin monkeys vs squirrel monkeys. The same rule applies to the coatis, which patrol the picnic areas with a confidence that catches people out.

Is the shoreline worth a guide, or should I just walk it?

You can absolutely walk the beach alone. A guide changes what you notice, not whether you get there.

The realistic version: the crabs are easy and you will find them yourself. What a guide adds is everything you would otherwise walk past — which burrow belongs to what, why the tombolo is there, and the sloth in the tree above the sand that nobody in your group has spotted. The Classic Group Tour is $30 per person with a certified naturalist guide and a professional spotting scope, and the beaches are part of the route. Park entrance is separate: $18.30 for adults and $5.65 for children, set by SINAC and subject to change.

Planning the rest of the visit? Start with the complete first-timer’s guide to Manuel Antonio National Park, and if you have a spare day, the best day trips from Manuel Antonio covers what is worth leaving town for.

Guide: Jason Solano Zamora, ICT-certified naturalist guide and founder of Costa Rica Wakoo Tours.

Travelling in December 2026 or January 2027? That is the driest, busiest stretch of the year in Manuel Antonio and the morning departures fill first. Book your Manuel Antonio tour for December 2026 – January 2027 — the Classic Group Tour stays at $30 per person, naturalist guide and spotting scope included, park entrance paid at the gate. The park closes every Tuesday, 9 of them inside that window, so the date you pick matters.

Not sure which morning to take? WhatsApp us at +506 8514-1361 and we will check availability for your dates.