Alien Earthlings

in Drake Bay, Costa Rica



Tracie "The Bug Lady"  invites you  on an out  of this world  walk on...
The Dark Side

Discover the hidden treasures of Drake Bay,  Costa Rica with Tracie "The Bug Lady"


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Emerald Glass Frog - Cenrtolenella prosobleponCascade Glass Frog - Cochranella albomaculataGranular Glass Frog - Cochranella granulosaCricket Glass Frog - Hylinobatrachium colymbiphyllumDusty Glass Frog - Hylinobatrachium pulveratumReticulated Glass Frog - Hylinobatrachium valerioi
Emerald Glass Frog

Espadarana prosoblepon

Cascade Glass Frog

Sachatamia albomaculata

Granular Glass Frog

Cochranella granulosa

Cricket Glass Frog

Hyalinobatrachium colymbiphyllum

Dusty Glass Frog

Teratohyla pulveratum

Reticulated Glass Frog

Hyalinobatrachium valerioi


The Granular Glass Frog

Cochranella granulosa


Granular Glass Frog - Cochranella granulosa


The Granular Glass Frog is found throughout the humid lowlands of Honduras, Nicaragua, Costa Rica, and Panama. The common name is due to the skin's granular texture. Adults may measure from 23 to 32 millimeters. Granular Glass Frog - Cochranella granulosa

Underneath, the abdomen is transparent and the red ventral vein as well as the intestines are visible. The intestines  are covered by a white membrane. In some individuals the red liver may also be visible.

They are normally found near fast moving streams, where males call from the upper surfaces of leaves. A male frog typically protects a calling territory, and if a rival male dares trespass, it gets ugly fast! Males have been observed engaging in sumo-style wrestling matches. They hang upside down, on the edge of a leaf, by the tips of their toes while clashing chest to chest and grappling fiercely in an attempt to dislodge each other. It may go on like this for over two hours! 


Granular Glass Frog - Cochranella granulosaOnce his territory is secure, the male will generally call from high vegetation overhanging a moving stream. He will usually move around and try out a few different calling perches as the evening progresses. Their call is a harsh "creep-creep-creep" normally repeated two or three times. When making their advertising call, males will call over each other in an attempt to drown out rival males. Because they often call perched high above our heads, seeing them is often difficult.



Granular Glass Frog - Cochranella granulosaIf the male successfully attracts a female, she will approach him and they will mate. She will normally lay her egg clutch several meters above a stream, on the tips of leaves. Egg clutches are made up of a thick, clear jelly mass and may contain between 40 and 70 eggs. The eggs will develop for 13 to 17 days and, after hatching, it will take several months for the tadpole to complete it's metamorphosis.

When the froglet is ready to emerge, as seen below, it leaves the water still sporting a long tadpole tail.

Granular Glass Frog - Cochranella granulosa


Upon reaching  dry land, it will remain fairly inactive for about five days while absorbing it's tail. This provides the young frog with nourishment and it will have no need to feed until the process is completed.



Kubicki, B.  2007  Costa Rica Glass Frogs  Editorial INBio

Leenders, T.  2001  A Guide to Amphibians and Reptiles of Costa Rica  Zona Tropical

Savage, J.  2002  The Amphibians and Reptiles of Costa Rica   University of Chicago Press


Mammals of the Osa Peninsula

The Frog Files

Frogs Home Page

Common Rain Frog - Craugastor fitzingeri

Gaufy Leaf Frog - Agalychnis callidryas

Gladiator Tree Frog - Hypsiboas rosenbergi

Glass Frogs Home Page

Emerald Glass Frog - Centrolenella prosobleponCascade Glass Frog - Cochranella albomaculataGranular Glass Frog - Cochranella granulosaCricket Glass Frog - Hyalinobatrachium colymbiphyllumDusty Glass Frog - Hyalinobatrachium pulveratumReticulated Glass Frog - Hyalinobatrachium valerioi

Gliding Leaf Frog - Agalychnis spurrelli

Hourglass Tree Frog - Dendropsophus ebraccatus

Giant Marine Toad - Bufo marinus

Masked Tree Frog - Smilisca phaeota

Smoky Jungle Frog - Leptodactylus petadactylus

Tink Frog - Diasporus diastema

Salamanders - Order: Caudata



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