Archive for July 28th, 2011


It’s been interesting to observe the changes to the frog community in our little pond. Just a few weeks old, the pond already looks quite settled, with water plants and duckweek created interesting patterns on the water surface. Within a few days of set up, frogs were already moving in, little Green Frogs (Rana clamitans melanota). Then I noticed that some of the Green Frogs were, in fact, Bullfrogs (Rana catesbeiana). The two species are rather similar, but Bullfrogs are bigger, the largest frog species in North America. Knowing this isn’t too helpful, though, when you are looking at two juveniles of similar size, and a big Green Frog can attain impressive proportions too.


When I looked carefully at this pair, sitting together on a log, I could see that the individual on the right is a Bullfrog, while the leaper on the left is a Green Frog. The green on the Bullfrog’s face is more broad and shades into his body colour, while the bright green on the Green Frog’s face more closely resembles a moustache. Also, you can easily see the distinctive line formed by the dorsolateral fold running along the upper side of the Green Frog.

For a while, the little frogs all shared the pond. On one day, I counted 15 of them. Then, a very large, mature Bullfrog moved in. That’s him in the opening photo. That cleared the pond! It’s a big frog eat little frog world, and the juveniles decided it was time to seek out new living quarters. I heard the Bullfrog singing last night, but this morning when I looked in the pond, I couldn’t see any frogs. Not one. It will be interesting to see how the population changes over the remainder of the season. Below is a photograph of one of the smaller frogs resting in duckweed. I like the way his pattern camophlages him so well in the vegetation.


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