The European tree frog is a small frog that can grow to 4,5 cm in size at most. Historically, tree frogs were used as barometers because they respond to approaching rain by croaking. In the breeding season, even when migrating to their mating pools, they croak as well. Depending on subspecies, temperature, humidity, and the frog's 'mood', skin color ranges from bright to olive green, grey, brown and yellow. The head is rounded, the lip drops strongly, the pupil has the shape of a horizontal ellipse and the eardrum is clearly recognizable.
Males can be distinguished from females by their browny-yellowy, large (folded) vocal sacs in the throat region. The amplexus is axillary (in the armpits). Both adult males and females reach sizes up to 30-40 mm, rarily longer than 45 mm. The smooth, shining, usually leaf-green back and the white-yellowish to grey belly are separated by a dark stripe on its flank reaching from the nostrils, over the eye and the eardrum, to the groin, contrasting the green, and forming a dark spot near the hips. The hind legs are much larger and stronger than the fore legs, which enables to jump rapidly.
Source : Wikipedia
This picture comes from Neusiedler See, where one can see hundred of them.
What a beautiful abstract photo where the frog plays hide and seek with you. I rally like how the colors of the frog and reet almost become one. The quality of the photo is outstanding, with perfect sharpness and clarity.
Although I'm not really a fan of animal photography, I must say that your picture is an outstanding one. It breaks pleasingly with the very classic pictures and differs from them by its abstract effect that I like very much. What also makes it different and special is the unity of the color tones.
From my point of view, but this is very personal, you could crop your picture a little bit to reduce the dark green surface on the right. It is too important by its surface and doesn't improve or sustain the main subject.