jprbelli's Identifications

2 California Red-legged Frogs very well camouflaged by pond duckweed and leaves. Link to the larger one nearby: https://www.inaturalist.org/observations/208380253
Link to Duckweed observation: (pending)

California Red-legged Frog (Rana draytonii) is an amphibian in the Amphibians (Amphibia) class.
Conservation Status: Imperiled (N2N3) in United States (NatureServe).

Amphibians and Reptiles of California: (includes great photos, description, rangemap) https://californiaherps.com/frogs/pages/r.draytonii.html

"It is a species of frog found in California (USA) and northern Baja California (Mexico). It was formerly considered a subspecies of the northern red-legged frog (Rana aurora). The frog is an IUCN near-threatened species as of 2021, has a NatureServe conservation status of Imperiled as of 2015, and is a federally listed threatened species of the United States that is protected by law. One cause of the population decline is habitat loss and destruction, but introduced predatory species, such as American bullfrogs, might also be a factor. Their habitats are in close proximity to roads and trails, indicating traffic, runoff, pollution, and other human interference may be a significant threat to the species. The species has also been found thriving in undisturbed and isolated ponds in comparison. Vegetation diversity and surface coverage on smaller ponds indicate a greater likelihood of the species being present.
California Red-legged Frog is a moderate to large (4.4–14 cm or 1.7–5.5 inches) long frog. It is the biggest native frog species in the western United States. The back is a brown, grey, olive, or reddish color, with black flecks and dark, irregular, light-centered blotches, and is coarsely granular. A dark mask with a whitish border occurs above the upper jaw, and black and red or yellow mottling is in the groin. The lower abdomen and the undersides of its hind legs are normally red. The male can be recognized by its large fore limbs, thumbs, and webbing. Only a portion of the toes are webbed, and it uses vocal sacs to grunt during breeding season. The juvenile frog has more pronounced dorsal spotting, and may have yellow, instead of red, markings on the undersides of the hind legs. A characteristic feature of the red-legged frog is its dorsolateral fold, visible on both sides of the frog, extending roughly from the eye to the hip. R. draytonii looks very similar to the northern red-legged frog.
This species has disappeared from an estimated 70% of its range, and is now only found in about 256 streams or drainages in 28 counties of California. However, the species is still common along the coast, and most of their population declines are in the Sierra Nevada and Southern California. The California red-legged frog is an important food source for the endangered San Francisco garter snake in San Mateo County. The California newt is often found with this species due to sharing habitat requirements and the newts eating their eggs. The California red-legged frog primarily eats earthworms, beetles, flies, and other winged insects. There have been instances where the species was viewed preying on juvenile snakes, small mammals such as mice, and other frogs and tadpoles.
Breeding occurs from late December to early April. The male frog's advertisement call is a series of a few small grunts, usually given while swimming around under water. Choruses are weak and easily missed. The adult California red-legged frog is nocturnal, while juvenile frogs are both nocturnal and active during the daytime. The species inhabits dense, shrubby, or emergent riparian vegetation and still or slow-moving perennial and ephemeral water bodies that also serve as breeding sites. This species has been noted to utilize upland habitats as adults near aquatic areas (such as creeks). They often use these zones for basking and searching for prey. They prefer tall plants such as cattails for protection and to lay eggs.
The tadpoles (larvae) of this species may metamorphose into frogs within about 7 months of hatching from the egg, or may overwinter, taking up to 13 months. This is a recent discovery, which may have management implications for the species, particularly when aquatic habitat undergoes modification.
The California red-legged frog exhibits several behaviors when approached by predators. They either stay immobile, quickly leap into vegetation in an upland habitat or a water source nearby, or, rarely, give off an alarm call to indicate danger." https://www.inaturalist.org/taxa/67016-Rana-draytonii

HerpMapper https://www.herpmapper.org/taxon/Rana_draytonii

Amphibians and Reptiles of California: https://californiaherps.com