I am back in Costa Rica to work for another two months as a naturalist guide. It's always great to be here and admire the rich biodiversity. The night hikes are mainly focused on frogs... so here are a couple of the first species I found. Beginning with the most famous one: Red-eyed Tree Frog (Agalychnis callidryas).
![Agalychnis callidryas - Red-eyed Tree Frog](https://static.wixstatic.com/media/35a196_ff7576fba59b49fea56a063e12971345~mv2.jpg/v1/fill/w_980,h_654,al_c,q_85,usm_0.66_1.00_0.01,enc_auto/35a196_ff7576fba59b49fea56a063e12971345~mv2.jpg)
This tiny juvenile Dwarf Glass Frog (Teratohyla spinosa) measures around 1 cm (0.39 in). Finding this adorable frog in the rainforest was like finding a needle in a haystack. A very common, still beautiful species is the Masked Tree Frog (Smilisca phaeota). I found one posing nicely on a vine. Another really cool sighting of the first tours was a Reticulated Glass Frog (Hyalinobatrachium valerioi).
![Teratohyla spinosa - Dwarf Glass Frog](https://static.wixstatic.com/media/35a196_631d4de25c644416b0dd9966d239a85f~mv2.jpg/v1/fill/w_980,h_654,al_c,q_85,usm_0.66_1.00_0.01,enc_auto/35a196_631d4de25c644416b0dd9966d239a85f~mv2.jpg)
![Smilisca phaeota - Masked Tree Frog](https://static.wixstatic.com/media/35a196_6978af24254745b5a47277aaee433c8a~mv2.jpg/v1/fill/w_980,h_654,al_c,q_85,usm_0.66_1.00_0.01,enc_auto/35a196_6978af24254745b5a47277aaee433c8a~mv2.jpg)
![Hyalinobatrachium valerioi - Reticulated Glass Frog](https://static.wixstatic.com/media/35a196_593c0809fce143f6a6024766923a4426~mv2.jpg/v1/fill/w_980,h_654,al_c,q_85,usm_0.66_1.00_0.01,enc_auto/35a196_593c0809fce143f6a6024766923a4426~mv2.jpg)
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