WILD LIFE | 06.21.16

Frog Leg Feast

With native fish populations in decline, resourceful European otters have turned their attention to frogs and toads, a food source that presents its own challenges.

Photograph by Sven Zacek

SHARE

Although most European otters (

Lutra lutra

) tend to prey primarily on fish, some have developed a taste for frogs and toads—a food choice that requires some deft preparation. Because common toads (

Bufo bufo

) have toxins in both their skin and the glands on either side near the front of their bodies, these resourceful otters use their sharp teeth to remove the skin from the back half of the toads and then eat just the hind legs. While common frogs (

Rana temporaria

), like the hapless individual in this photograph, don’t have toxic skin or glands, most otters appear to not know the difference, and generally play it safe by following the same food-prep routine they use on toads. In river systems where the otter’s traditional foods—including salmon, butterfish, and eels—are in decline, amphibians have become an increasingly important part of their diet. At the same time, the otters have become increasingly resourceful. In recent years, a number of individuals have been observed completely removing the skin from frogs and toads, an extra step that allows them to eat both the front and hind legs of their amphibian prey. Photographer Sven Zacek spent 10 days watching this female otter hunt along a river in southern Estonia. Zacek recounts that this proficient hunter brought up a meal after every dive—and on almost every occasion, that meal was a frog.

Southern Estonia

SHARE

ABOUT THE Photographer

Sven Zacek is a freelance photographer who shoots a wide range of subject matter but is particularly drawn to wildlife and landscapes. Since becoming a photographer in 2005, he has published seven books, written hundreds of articles, and given hundreds of workshops. He is the Editor-in-Chief and publisher of the Estonian nature photography magazine

LoFo

.

Sven Zacek

RELATED

TOPICS

ARTICLES

Portrait-worthy for more than just its beauty, this toxic frog may revolutionize our approach to pain management.

spotlight | 09.19.17

Framed Frog

Climate change may have forced these Galápagos sea lions to turn to a new food source. Since they can't outswim their prey, they use wits and teamwork instead.

photo essay | 11.06.18

The Tuna Herders

Shimmering schools of fish have dazzled scientists for centuries with their synchronized maneuvers. Now, high-speed video is revealing how they do it.

video | 08.08.17

Lens of Time: Secrets of Schooling

bioGraphic

is powered by the California Academy of Sciences, a renowned scientific and educational institution dedicated to exploring, explaining, and sustaining life on Earth.

©2018 California Academy of Sciences. All rights reserved.