For nearly eight years, we've been growing a forest at Proyecto Tití's Los Titíes de San Juan Reserve. Since 2018, our germination beds have been the starting point for more than 150,000 plants, each grown from a tiny seed with the hope that one day it will become part of a thriving tropical dry forest. It's an incredible process to watch. A seed is planted, a tiny green shoot emerges, and eventually that little seedling is ready to be transplanted into the forest, where it will provide food, shelter, and habitat for cotton-top tamarins and countless other species.
Over the years, we've gotten pretty good at growing trees from seeds. But apparently, someone in the forest has decided that we're also pretty good at providing free meals! And so began The Great Seed Heist of Los Titíes de San Juan Forest Reserve!
The Case of the Missing Seeds
It all started innocently enough. Our restoration team had planted seeds of Ceiba de leche (Hura crepitans), a native tree species, in one of our germination beds. We thought it would be fun to set up a time-lapse camera to capture the magic of germination—watching a seed crack open, send down its first root, and push a tiny green shoot toward the sunlight. What a wonderful way to share the incredible process of forest restoration! Except something very strange happened. When our team returned to check on the seeds, they were gone! The only clues were some tiny tracks in the sand, but they weren't clear enough to identify the culprit.
Seeds don't just get up and walk away, so we decided to try again. More Ceiba de leche seeds were carefully planted, and we waited. Sure enough, the seeds disappeared again! But this time, our mysterious visitor left behind something important: a much clearer set of footprints. The tracks belonged to a rodent!
Not So Fast! Don't Blame the Rats!
Now, I know what you're thinking. A rodent stealing seeds? It must be a nasty rat! But not all rodents are the rats and mice that sometimes invade our homes. Our tropical dry forests are home to a variety of native rodents, including some rather adorable little spiny rats (Proechimys sp.). These forest dwellers are part of a much larger community of animals that help keep the ecosystem functioning. Rodents can play important roles in forest regeneration. Some consume seeds, while others carry or bury them, occasionally allowing forgotten seeds to germinate into new trees. Of course, eating seeds we've carefully planted for restoration isn't exactly the kind of forest regeneration assistance we had in mind! But before accusing our little visitor, we needed proof.
Caught Red-Handed—or Should I Say, Red-Pawed!
Being good scientists, we weren't about to convict anyone based on footprints alone. So our team set up camera traps near the germination beds to catch our seed thief in action. And wouldn't you know it? There was our culprit—a little spiny rat, caught on camera helping itself to the seeds we had so carefully planted!
Mystery solved! I have to admit, it's hard to be angry when you see this little animal going about its business. From its perspective, it had discovered something wonderful: a conveniently located buffet of delicious seeds, regularly replenished by some very accommodating humans. Apparently, our restoration team had unknowingly become the restaurant staff!
But Why Now?
Here's the part of the mystery that I find particularly fascinating. We've been germinating seeds at Los Titíes de San Juan since 2018, successfully raising 180,000 trees. So why, after all this time, are our seeds suddenly disappearing? Our camera traps suggest that one particularly resourceful little rodent may be responsible, although where there's one spiny rat, there may very well be others! Could this sudden interest in our seeds be related to the unusually dry conditions we've been experiencing? Tropical dry forests undergo dramatic seasonal changes, and a lack of rainfall can affect the availability of fruits, seeds, and other natural food resources. Perhaps our little visitor is having a harder time finding food in the forest and has discovered an alternative food source. Or maybe the explanation is much simpler. Perhaps one clever little spiny rat stumbled upon our germination beds, discovered an abundant supply of tasty seeds, and decided that searching for food in the forest was entirely unnecessary when Proyecto Tití was offering an all-you-can-eat buffet! We don't know the answer yet, but that's what makes science so interesting. Sometimes the most unexpected observations lead to the most fascinating questions.
A Forest Is More Than Just Cotton-Top Tamarins
At Proyecto Tití, our mission is to protect cotton-top tamarins and the tropical dry forests they call home. But one of the things I've learned from working in these forests for so many years is that you can't protect a species without understanding the incredible community of plants and animals that surrounds it. Every animal has a role to play, even the ones that occasionally make our jobs a little more difficult. Our little spiny rat isn't being naughty. It's simply doing what wild animals do: finding food and surviving in its natural habitat. And while we're not particularly thrilled that it has developed a taste for our restoration seeds, its appearance gives us another opportunity to learn about the animals sharing this forest.
Sorry, Little Guy. The Restaurant Is Closed!
Of course, as much as we appreciate our little visitor, we can't afford to have thousands of seeds disappearing before they have a chance to germinate. Our restoration team needed a solution that would protect the seeds without harming the wildlife we're working so hard to conserve. So they got creative and constructed wire-framed lids to cover the germination beds, allowing sunlight and rain to reach the seeds while keeping hungry little visitors from helping themselves. It's a simple solution, but one that illustrates an important lesson in conservation: protecting wildlife sometimes means finding creative ways to coexist, even when our interests don't quite align. Our little spiny rat is welcome to continue living in the forest, but the seeds we're growing to restore that forest need a chance to become trees!
We'll continue watching our camera traps to see whether other rodents discover the germination beds and whether changing conditions in the forest might explain this sudden interest in our seeds. In the meantime, our restoration team can get back to growing trees, and our little seed thief will have to return to finding its meals in the forest. As for our resourceful little rodent, I'm afraid the all-you-can-eat buffet at Proyecto Tití has officially closed! No reservations, no takeout, and definitely no more free seeds! But knowing how clever wildlife can be, I wouldn't be surprised if our little visitor is already looking for another way to get a free meal. Stay tuned!