Pacific Treefrog / Baja California Treefrog (Pseudacris regilla / Pseudacris hypochondriaca)
Order Anura, Family Hylidae (Treefrogs), Genus Pseudacris (Chorus frogs). Hylids are typically characterized by expanded toe discs for climbing and an arboreal or semi-arboreal lifestyle.
Species
Pacific Treefrog / Baja California Treefrog (Pseudacris regilla / Pseudacris hypochondriaca)
Family
Order Anura, Family Hylidae (Treefrogs), Genus Pseudacris (Chorus frogs). Hylids are typically characterized by expanded toe discs for climbing and an arboreal or semi-arboreal lifestyle.
Size
Snout-to-vent length (SVL) ranges from 1.9 to 5.0 cm (0.75 to 2.0 inches). Females are generally larger than males. Metamorphs are around 1.2 to 1.5 cm in length.
Conservation
IUCN Status: Least Concern (LC). Populations are stable and widespread, showing high adaptability to human-altered suburban environments.
Description
A charismatic and highly adaptable native treefrog of western North America, famous for its iconic 'ribbit' call. This small amphibian displays remarkable color variation ranging from bright green to dark greyish-brown.
Key Features
Dark mask/stripe from nostril through eye to shoulder, expanded toe discs, small size under 2 inches, and granular dorsal skin.
Physical Description
Small, compact treefrog with a rounded snout, moderately large eyes with horizontal pupils, and prominent expanded adhesive toe pads. The limbs are slender but well-adapted for hopping and climbing. A distinct dark stripe or mask extends from the nostril through the eye to the shoulder.
Skin Texture & Coloration
Skin texture is slightly granular on the dorsum and sides. Coloration is highly variable, ranging from shade of olive green, brownish-gray, to dark green/grey (as seen in this specimen). A prominent dark eye stripe is present. Ventral surface is cream or off-white.
Distinguishing Features
The defining identification mark is the dark black or brown stripe running from the tip of the snout through the eye to behind the tympanum/shoulder. Adhesive expanded toe discs on all toes and a small body size are key diagnostic markers.
Habitat
Extremely adaptable; found in forests, woodlands, chaparral, grasslands, agricultural areas, and suburban gardens. Requires slow-moving streams, ponds, or artificial water bodies (like pools or hot tubs) for breeding.
Geographic Range
Native to western North America, ranging from British Columbia, Canada, south through Washington, Oregon, California, Nevada, and into Baja California, Mexico.
Behavior
Primarily nocturnal and crepuscular, though active during cool rainy days. Excellent climbers and jumpers. Often attracted to moist suburban settings like hot tub covers, potted plants, and outdoor lighting.
Diet & Feeding
Insectivorous opportunist using a sit-and-wait strategy to capture small invertebrates such as flies, beetles, ants, spiders, and moths using a sticky projectile tongue.
Reproduction
Breeds from early winter to spring triggered by rainfall. Males aggregate at water sources and call to attract females. Females lay small jelly clusters of eggs attached to submerged vegetation.
Vocalizations
Produces a loud, high-pitched two-tone 'ribbit' or 'creek-ee' advertisement call. The chorus created by multiple calling males can be surprisingly deafening at close range.
Life Cycle
Eggs hatch into aquatic tadpoles in 1 to 3 weeks. The tadpole stage lasts 2 to 3 months before metamorphosis into tiny froglets. Lifespan in the wild is typically 2 to 5 years.
Conservation Status
IUCN Status: Least Concern (LC). Populations are stable and widespread, showing high adaptability to human-altered suburban environments.
Toxicity & Defense
Non-toxic to humans, but skin produces mild protective secretions that can irritate eyes or mucus membranes if touched. Primary defense relies on camouflage, quick leaps, and hiding in crevices.
Ecological Role
Serves as an essential mid-level predator controlling local insect populations and acts as a vital food source for garter snakes, birds, small mammals, and larger amphibians.
Similar Species
Boreal Chorus Frog (Pseudacris maculata) - lacks prominent toe pads; Sierran Treefrog (Pseudacris sierra) - genetically distinct split within the P. regilla complex with overlapping appearance.
Observation Tips
Look near damp garden areas, under outdoor furniture, or near pool covers at dusk. Listen for their distinctive chorus during rainy winter and spring nights.
Handling & Safety
If found in a hot tub area, gently relocate using clean wet hands or a soft container to a moist, shady garden area away from chlorinated water and pet access.
Seasonal Activity
Active year-round in mild coastal regions. Peak activity and loud vocalizations occur during winter and spring rains; may seek cool, moist microhabitats during hot summer months.
Cultural Significance
Recognized as the official state amphibian of Washington state. Often featured in popular media and nature documentaries representing North American wildlife.
Interesting Facts
The classic 'ribbit' sound made by this species was recorded and used as the standard background frog sound in Hollywood films for decades, making its call famous worldwide.
Notes
Hot tub