First of all Alan is an great tour guide !Very friendly and knowledgable about Costa rica and the different species of animals that inhabit this beautiful country. I first met Alan at Corcovado National Park while on a separate excursion, but i was planning on visiting Drake Bay to go scuba diving later that week , so I decided to book a night trip with him to go look for frogs. We met and went off to a near location and i was extremely pleased with his service and knowledge about the different frog species, he was even able to recognize their calling which helped spot them as we made our way through the jungle. Highly recommend this guide , make sure you book him at Osa Adventure!