### Identification The Iberian Water Frog (*Pelophylax perezi*) is a medium-sized, athletic frog reaching up to 10cm, though most are smaller. Its coloration is a vivid tapestry of mossy greens, bronzes, and earthy browns, usually punctuated by dark, irregular spots. Look for the "racing stripe"—a bright, pale-green vertebral line running from snout to vent. A key field mark is the pair of prominent glandular ridges (dorsolateral folds) running down its back. To distinguish it from the similar Graf’s Hybrid Frog, look at the legs: if you gently press the hind leg forward, the "heel" (tibio-tarsal articulation) of a true *P. perezi* rarely reaches beyond the snout.
### Habitat & Range This is the quintessential frog of the Iberian Peninsula, found across Spain, Portugal, and spilling into Southern France. It is remarkably adaptable, inhabiting everything from high-altitude glacial lakes at 2,400 meters to brackish coastal marshes and even concrete irrigation ditches. As long as there is permanent water and a sun-drenched bank for basking, this frog will thrive.
### Behaviour If you walk near a pond in the Mediterranean sun, you’ll likely hear a series of sudden "plops" before you see the frogs. They are highly diurnal and spend hours basking. During the spring breeding season, the water comes alive with their "laughing" calls—a series of staccato croaks amplified by two greyish vocal sacs that inflate like balloons at the corners of the male's mouth. They are wary; a single shadow can send an entire colony diving into the mud.
### Diet An opportunistic ambush hunter, *P. perezi* sits motionless until prey wanders within striking distance. They primarily feast on terrestrial invertebrates like dragonflies, beetles, and spiders. However, larger adults are formidable predators and won't hesitate to swallow smaller frogs, tadpoles, or even the occasional small bird or shrew.
### Fascinating Fact The Iberian Water Frog is a biological "thief." It participates in a process called hybridogenesis, where it mates with other *Pelophylax* species to produce hybrids. These hybrids then "discard" the other parent's DNA when they produce eggs or sperm, ensuring only the *P. perezi* genome is passed on—effectively hijacking the other species to clone itself!