Mink Frog

Fascinating facts about the Mink Frog

• A single female can drop anywhere from 500 to 4,000 eggs into deep water, and the gelatinous masses cling to floating leaves before hatching in just a few days.
• Males announce themselves late at night by floating on the surface and croaking, yet they sometimes sing in daylight. Their bright yellow throats flash, signaling fitness to waiting females.
• Tadpoles linger in the water for about a year before becoming froglets, enduring predators such as tiger salamander larvae and giant water bugs.
• The mink frog holds the record for the highest latitude among North American frogs, stretching from Minnesota up to Newfoundland and Labrador, yet southern populations have vanished in the last hundred years. Their edge-of-the-world range highlights how climate and habitat shifts can erase even the most cold-adapted amphibians.
• A 1999 study by David Gardiner and David Hoppe found a surge in limb deformities, missing, extra, or oddly bent bones forming a triangular shape, linked to exposure to exogenous retinoids.

At a glance

About the Mink Frog

The mink frog (Lithobates septentrionalis) is a diminutive amphibian, scarcely exceeding 7.6 cm (3.0 in) in length, its dorsal canvas a vivid green mottled with darker green and brown blotches, while a cream-to-white belly and bright green lips frame a face that hints at its curious moniker. Males betray their identity with a striking yellow throat and a tympanum that outpaces the eye, whereas females display a white throat and a smaller or equal-sized tympanum. Their scent, likened to a mink by some and to rotting onions by others, adds an olfactory twist to their visual charm, making the “north frog” a memorable presence in the wetlands it calls home. These frogs are almost entirely aquatic, weaving through lily-pad clusters in ponds, swamps, and forest-bordered streams. Their diet is a bustling buffet of spiders, snails, beetles, and assorted invertebrates, while their tadpoles scrape algae and decaying plant matter from the water column. Breeding erupts in late spring and early summer, when males float or perch on vegetation, emitting nocturnal calls that lure females to lay between 500 and 4,000 eggs in deep, oxygen-rich water. A single year sees tadpoles metamorphose, males mature in one year, and females in two, ensuring a rapid turnover that sustains their populations despite predation from bullfrogs, garter snakes, herons, and even leeches.

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