Hyla japonica, commonly known as the Japanese tree frog, is a species of anuran native to Japan, China, and Korea.

[2] H. japonica are not currently facing any notable risk of extinction and are classified by the IUCN as a species of "least concern".

[5] The Japanese tree frog lives in a variety of habitats such as wetlands, forests, rivers, and mountains.

There is an estimated 100 million of these frogs in Japan, but the accuracy is limited due to difficulty in counting.

[11] Frogs observed in South Korea were found to be entirely blue, while others yellow, with green dorsal patterns.

[11] Specific reasons behind such observations in color are currently unexplained, but mutations and maladaptations have been put forth by scientists as possible explanations.

[11] H. japonica are found in many parts of Asia, specifically in Japan, China, Korea, Mongolia, and Russia.

[5] H. japonica inhabits forest-like environments, bushlands, meadows, swamps, and river valleys.

[5] Changes in availability of native H. japonica habitats have resulted in rice paddies serving as lodging for H.

[12] H. japonica seems to be able to inhabit these rice paddies successfully and have a demonstrated preference for sites high in vegetation.

[13] H. japonica were shown to adapt to the microgravity and were able to improve their jumping and perching activity over time.

[13] H. japonica, under micro-gravitational conditions, were also observed to attempt to eat but were unable to ingest the food.

[10] Notes of H. japonica calls are made up of fine pulses, and exist mainly at the frequency of 1.7 kHz.

[15] H. japonica prefer bodies of water termed oxbow lakes, likely due to their freestanding nature and higher chance of being refilled.

[15] Oxbow lakes are likely preferred due to the inability of tadpoles to swim along or against strong currents.

H. japonica seems to be susceptible to Chytridiomycosis, however the disease does not appear to pose a high burden to this species.

[16] Another hypothesis is that H. japonica increases its reproductive effort in the event that they die earlier due to Chytridiomycosis.

[18] Both species inhabit rice paddies and this shared habitat is a possible explanation for the observed interspecies copulation.

[18] Further work is required to uncover the extent of heterospecific amplexus between H. japonica and Pelophylax chosenicus.

[19] H. japonica have evolved against predation in arboreal environments by producing special Anntoxin-like neurotoxins from their skin.

[21] While these peptides display analgesic properties after binding onto ion channels, they can harm and kill predators after frog skin consumption.

[2] The majority of H. japonica individuals in a population from the Amur River were shown to withstand multiple rounds of exposure to −30 °C.

[2] H. japonica have also been studied in order to determine the predictive ability of bone mineral density on the physiological well-being of frogs.

[19] Thus, these frogs were unlikely to suffer from bone mineral diseases, and their fractures are more likely attributed to trauma-related injury.

[19] H. japonica has been used to determine the effects of anuran vasotocin (VT) and mesotocin[citation needed] (MT) receptors.

[22] Both MT and CT receptors are found in the brain, heart, kidney, and urinary bladder.

[3] The IUCN lists some potential threats to H. japonica, which are primarily pollution and related to other environmental factors.

[3] Specifically, droughts that will occur at a higher frequency due to climate change will negatively affect the habitats of H. japonica as they rely on inland water to survive.

[23] Ranavirus transmits through animal-animal contact and has symptoms including abdominal edema, skin hemorrhaging, as well as damage to the liver, kidney, and spleen.

[25] Humans have studied this ability of H. japonica males to behave in a coordinated manner despite no central organization or communication.