Bullfrog Gray Treefrog Green Frog
Rana catesbeiana Hyla versicolor Rana clamitans
I saw a beautiful Green Frog down at the pond
This can only mean it was a "Green Frog" – Rana clamitans – which might not even be green!
Green Frog
Rana clamitans

gray treefrog vs Gray Treefrog
What a cute gray treefrog!
This sounds like it was a treefrog that was gray ...
In a hole in the apple tree On my black jeans
What a cute Gray Treefrog!
This means it was a Hyla versicolor, which could be gray or green or anything in between.
All five of these pictures are Gray Treefrogs.

wood frog vs Wood Frog
(I admit, this one is a bit of a stretch – but it was fun!)
I've been looking for a wood frog, and I found a handsome one !
(Click here to find out where you can buy one of these.)
I've been looking for a Wood Frog, and I found a handsome one !
This can only mean a Rana sylvatica. The name comes from the fact that they hang out in the woods for most of the year.
This one was in my yard in the middle of the summer. I usually don't see them except in early spring, when they thaw out
and come to the pond to breed. (See Salamander Night)
This year (2009) I discovered they are in the cast of characters that populate road surfaces on wet summer nights.
(See Frogs in the Road)

Bullfrog
Spring Peeper
These two don't have the ambiguity problem, but if I capitalize some, I better capitalize all !
