Granulated Snouted Tree-frog

Represents a small to medium-sized hylid frog characterized by its slender body and highly specialized climbing adaptations. Adult males typically reach a snout-vent length of 25 to 30 mm, while females are slightly larger, ranging from 32 to 38 mm. Its dorsal skin is distinctly granulated or warty, which inspires its specific name, and displays a highly variable coloration ranging from grayish, brownish, to greenish tones. The dorsum is often adorned with dark, irregular markings, frequently forming an "X" or inverted "V" pattern. The hidden surfaces of the thighs and flanks feature a vibrant bright yellow or orange coloration, which serves as a flash color to startle predators when the frog leaps. Its long, slender limbs terminate in well-developed adhesive discs on the digits, enabling it to climb vertical surfaces with remarkable agility.

Geographical distribution: This amphibian is widely distributed across the central-southern regions of South America. Its range encompasses northeastern Argentina (including the provinces of Buenos Aires, Entre Ríos, Corrientes, Misiones, Santa Fe, Chaco, and Formosa), the entirety of Uruguay, southern and eastern Paraguay, and the southern states of Brazil (such as Rio Grande do Sul, Santa Catarina, Paraná, and São Paulo). This extensive range highlights its ecological plasticity and successful colonization of diverse river basins and transition zones throughout the Neotropics.

Habitat: It occupies a broad variety of ecosystems, showing a high level of tolerance toward human-modified environments. It is frequently encountered in wet grasslands, savannas, forest edges, wetlands, and agricultural areas. Additionally, it is a very common inhabitant of urban and suburban gardens, public parks, and residential zones where stagnant water sources are available. It utilizes both low vegetation—such as shrubs, reeds, and tall grasses—and artificial structures, including building walls, pipes, and window panes, utilizing these vertical surfaces for shelter during daylight hours.

Feeding: Operating as an opportunistic and generalist insectivore, its diet consists of a wide array of small terrestrial and flying invertebrates. Common prey items include dipterans (flies and mosquitoes), coleopterans (small beetles), lepidopterans (moths), as well as spiders, ants, and small hemipterans. Its hunting strategy is highly active. During the night, it frequently congregates around artificial light sources near human dwellings, taking advantage of the high concentration of insects attracted to the light, which allows for efficient foraging with minimal energy expenditure.

Behavior: It exhibits strictly nocturnal and crepuscular habits. During the day, it seeks refuge in crevices, under tree bark, within the leaf axils of bromeliads, or inside narrow gaps in human structures to prevent dehydration. Its activity increases significantly on humid or rainy nights, particularly during the spring and summer seasons. Males possess a highly distinctive, loud advertisement call resembling a metallic rattle or a rapid, repetitive rasp. They vocalize while perched on emergent vegetation or at the margins of water bodies to attract females and establish territorial boundaries against rival males.

Reproduction: This species employs an opportunistic breeding strategy closely tied to periods of heavy rainfall. Amplexus is axillary. Spawning takes place in lentic water bodies, ranging from permanent ponds to temporary pools, roadside ditches, and backyard swimming pools. The female deposits a gelatinous mass containing hundreds of small dark eggs, which adhere to submerged aquatic vegetation or float freely on the water surface. Embryonic development is rapid, with hatching occurring within a few days. The tadpoles are nektonic, brownish with golden flecks, and tolerate fluctuating water temperatures well, completing metamorphosis in a matter of weeks.

Conservation status: It is currently classified as Least Concern (LC) on the IUCN Red List of Threatened Species. This assessment is justified by its extremely broad geographical distribution, stable and abundant populations, and exceptional ability to adapt to human-altered landscapes. While there are no major global threats to this species, localized populations may experience declines due to water pollution from agricultural runoff and the destruction of native wetland habitats.