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Habits Of The Toad, Ceratophrys

A MISHAP which throws additional light on the voracious habits of the South American toad Ceratophrys deserves to be put on record. Four of these creatures were received here at the end of June and at the same time two small alligators. When they came, only one vivarium was ready for use, and for a week the toads and alligators shared accommodation in it. They appeared to ignore one another and to be perfectly content. The alligators spent much of the time basking on the top of a small wooden penthouse or immersed in the water trough: the toads dug themselves comfortable burrows and were soon effectively concealed. Both took the food that was offered to them, the toads showing an appetite for the common frog and the alligators for a diet of beef and worms.

Frogs And Toads Of New York

Most everyone recognizes frogs. Frogs, like salamanders and newts, are amphibians. Unlike salamanders, they have made a major evolutionary detour from the body plan of their ancient ancestors. The hind legs of frogs are much larger than the forelegs and the tail has disappeared. This allows a new mode of locomotion, namely jumping, an effective method to elude their many predators. Because they leave the ground to get around, using scent to communicate with each other is not a viable option, as it is for salamanders. Consequently, frogs are among the most vocal of vertebrate animals (birds fly, so they vocalize a lot as well!). Frogs in New York fall into four major groups (families) linked by anatomy and other features of their biology.

Toads

Toads are frogs that, due to the nature of their coarse dry skin, are adapted to spend most of their life on land. We have three kinds in two different families. The very common American toad is easily recognized by the warts all over its back and sides and by a pair of large bean-shaped glands are located just behind the head. These glands produce a mild poison that the toad stores in its bladder. When handled, toads will produce a copious urine with enough of this foul-tasting toxin to deter most predators. As a consequence, toads do not need to be good leapers to escape their enemies. Toads begin breeding late in April when males begin producing their long, rather musical trill. One can imitate this call by whistling and humming at the same time. Toads use all sorts of water bodies to deposit their long strings of eggs. Since hatching and tadpole development can be completed in as little as four to six weeks, toads often use temporary bodies of water to deposit eggs. This may include large puddles and deep tire tracks that hold water.

The similar Fowler's toad is found in the southeastern part of the state and on Long Island. It has many warts in each of the dark spots on its back and sides, while the American toad has one or two warts per spot.

One representative of the spadefoot toad family reaches New York, although they are restricted to the sandy-soil pine habitats of Long Island and the Pine Bush near Albany. Spadefoots can be recognized by their rather smooth skin, vertical eye pupils, and the dark hard patches of skin on their toes used for digging. They spend much of their time underground and are most active on the surface at night following heavy spring and summer rains.

Treefrogs

The only true tree frog of New York, the gray treefrog, is common over the entire region. It is most often observed in late spring and early summer when the males make their characteristic loud trilling calls. Calling sites are usually in the lower branches of trees near the water's edge. They possess large round toe pads that enable them to maintain their grip even on vertical surfaces. Adults are mostly gray with black splotches but they can change their color pattern to a degree and may appear bright green to silvery. A flash of yellow is found on the undersides of their legs.

The spring peeper is clearly one of the most common vertebrate animals in New York, found in nearly all forested habitats within a few miles of standing water. Although few have actually seen one, nearly everyone has heard the distinct, and very loud, peep these tiny frogs produce. Despite their inclusion in the treefrog family, peepers are rarely found in trees. Outside of the breeding season they may be found leaping along the forest floor in search of insects. And what a leap it is, nearly 50 times their inch and a half length! In the breeding season, male peepers gather in the weedy vegetation at the edge of ponds to call and attract females for mating.

Eggs are attached singly to underwater plants and hatch within a week. After about 45-60 days, depending partly on water temperature, the tadpoles emerge from the water and inhabit the leafy litter of the forest. Other members of the treefrog family include the northern cricket frog, found in a few areas south of the Catskills, and the western chorus frog, which occurs along the western Lake Ontario plain and the Watertown area.

Typical Frogs

The bullfrog is the clear winner in the size department among New York frogs, attaining lengths of 7 inches from snout to tailbone. The low frequency "jug-o-rum" call they produce is familiar to all May and June visitors of the region's lakes and ponds.

Like all amphibians, bullfrogs are carnivorous and they will attempt to eat anything that will fit into their considerable mouths. This includes insects, snakes, other frogs, and even birds and mammals. Like most frogs, bullfrogs are visual predators and will react by orienting their bodies towards any small movements around them. If you see a frog catch an insect, look closely and it seems like it closes its eyes as it swallows. Small muscles attached to the eyeball pull it towards the back of its throat and help force the food down into the stomach.One of the most common mid-sized frogs across New York is the green frog. They can be superabundant in marshes, ponds, lakes, and quiet backwaters of streams if their insect food supplies are also abundant. Male green frogs, like those of bullfrogs, have visible eardrums on the side of their heads that are bigger in diameter than their eye. The eardrum of females is smaller than the eye. Green frogs make at least six vocalizations, but the most often heard is the advertisement call of the male. It has been compared to plucking a banjo string.

Mink frogs may be found in the colder waters of northern New York, primarily in the Adirondacks. They are small frogs that at first glance are easily confused with the much more common green frog. Careful examination of the spotting pattern across the folded hind limbs, which appears random in mink frogs and continuous in green frogs, will distinguish the two. The presence of a strong musky odor on your hands after you release one will clinch the identification as a mink frog.

Before winter is officially over, and often while there is still ice on the ponds, a sound like quacking ducks may be heard in forest ponds and beaver flows. This is the wood frog, the first of the New York amphibians to make an appearance each year.

Wood frogs hibernate in the leaf litter of the forest floor, usually just a few inches below the surface. Scientists have learned that these frogs, as well as the spring peeper and gray treefrog, can tolerate partial freezing of their body tissues, a condition that is lethal to most animals. They accomplish this through two methods. The first entails the use of antifreeze compounds, including the same ethylene glycol we put in our automobiles, that circulates in their blood and lowers the freezing point. The second mechanism involves removing much of the water from their cells so it doesn't freeze inside the cells. When water freezes, it expands and the resulting ice could easily break apart cell membranes.

Wood frogs possess a distinctive black patch around the eyes on an otherwise brown body. Wood frogs are found throughout the forested parts of New York and may be observed quite far from water. There are two species of common dark-spotted frogs found across New York, often side by side at pond edges. The northern leopard frog is light brown to bright green with dark round spots, each with a light border, found irregularly on its back and legs. The pickerel frog has a lighter background color and squarish spots with no light border which occur in two rows down its back. There is often a distinct flash of yellow coloration on the thighs of pickerel frogs. Both are fond of the grassy and weedy borders of ponds, and are often found quite some distance from the water. Their early spring staccato calls sound like a particularly loud snore and the two species may be distinguished by the pitch of their call.

Ecological Roles

Like most organisms, frogs are vital links between food web feeding levels because they are important food sources for many other organisms. Frogs, however, play a unique role in connecting aquatic and terrestrial food webs, due to their two lifestyles. All New York frogs start life as aquatic tadpoles, feeding on plant and animal material in water. When they metamorphose into air-breathing adults, they carry some of this aquatic energy stored in their bodies and export it onto land, where it can enter new food chains.

Checklist of Frog Species Found Within New York

Eastern Spadefoot

Eastern American Toad

Fowler's Toad

Northern Cricket Frog (Threatened)

Northern Gray Treefrog

Cope's Gray Treefrog

Northern Spring Peeper

Upland Chorus Frog

Western Chorus Frog

Bullfrog

Green Frog

Mink Frog

Wood Frog

Northern Leopard Frog

Southern Leopard Frog (Special Concern)

Pickerel Frog

Toads Are The Garden's Heroes. Here's How To Help Them Thrive.

Last year, Cynthia Berger tried for an autumn spinach harvest in her Pennsville, Pa. Garden. The pests got there first.

"It was slug city," says Berger. The slimy, shell-less mollusks turned the delicate leaves to Swiss cheese, leaving trails of sticky ooze in their wake. This year, Berger hopes to lure in a solution: hungry toads.

Though other garden wildlife — think bees and butterflies — tends to get more press, the often-overlooked toad can transform a vegetable plot. When it comes to pest control, toads are nature's Orkin men. They can quickly plow through bug populations, eating just about any insect, larvae, snail or slug they can get into their mouths.

It's clear what toads can do for us. But they need our help in return, says Gina Della Togna, executive director of the Amphibian Survival Alliance. The International Union for Conservation of Nature lists 41 percent of all amphibians on its Red List of threatened species. "It's an alarming situation," says Della Togna. "It's the highest percentage of threatened species compared to mammals, birds and reptiles. It's a crisis."

How can toads help your garden?

Despite their imperilment, the creatures are widespread. There are at least 20 types of toad in North America, with native species in every state except Hawaii. The amphibians are a subspecies of frog (all toads are frogs; not all frogs are toads). They breed in water but spend most of their adult lives on land.

And while they may seem squat and sedentary, they're actually dynamic predators, says Michael Benard, a herpetologist and interim biology department chair at Case Western Reserve University in Cleveland. The American toad — the species most commonly found in Eastern gardens — can shoot out a sticky tongue quicker than you can blink and eat as many as 100 insects in a night. Over the course of a gardening season, that means 10,000 fewer bugs to infest your crops.

"They will eat all sorts of things," Benard says. "Really, anything that's moving. They're going to key in on a beetle crawling, a fly landing in front of them, and that visual cue will set them off."

Toads are especially sensitive to pesticides, herbicides and even some fertilizers. "That's one of the big reasons we see amphibians that are going extinct or rapidly declining around the world," Benard says. Some of the primary drivers of amphibians' plight are habitat loss and the use of chemical contaminants. "When open space and farmland is converted into suburbs with no ponds and wetlands and no forested patches, you're going to lose your toads," he adds.

How to make a toad-friendly garden

The situation is dire, but in our gardens, at least, we can do something about it. Toads need a few basic things: water in which to breed (a small backyard pond or even a ditch that holds water in the spring will suffice), a moist, dark place to hide and soil to burrow into.

Most any gardener can become a toad landlord, says Benard. Garden centers and greenhouses often sell premade "toad abodes" — small decorative clay cottages and huts. But a toad home is also easy to DIY. "Just provide cover objects: logs, rocks, pieces of wood, with toad-sized spaces between them," Benard says. "They're looking for a moist, tight place where they can wedge their body and burrow themselves into the soil."

Berger uses overturned flower pots to create toad shelters in her garden. "It doesn't have to be fancy," she says. "You can just take a rock and prop the pot up so the toad can get underneath."

They also need a spot to soak. "The joke is that toads drink with their butts," says Benard. "They have vascularized skin on the underside of their legs and bellies, and they sit in water and absorb it through their skin."

Create a basic toad bath by placing a clay saucer of shallow water in a shady spot near the shelter. Just be sure to keep it clean and replace the water every day or two. Once you've created an appealing toad habitat, all that's left to do is wait.

"It's an 'If you build it, they will come' kind of thing," Benard says. And once they move in, you can protect them by avoiding the use of chemicals in and around the garden. Even common bug sprays can harm them, so make sure to apply those far away from the toad's home.

Della Togna says the most helpful thing people can do for toads is simply get to know them. "There's often a social or cultural component to people not liking amphibians," she says.

Beliefs persist that toads can give you warts (false) or that they're poisonous to the touch. The latter is half true: When threatened, they can secrete a toxin from lumpy glands behind their eyes. It's harmful if swallowed, but if you use caution with kids and dogs and wash your hands after any contact, says Della Togna, you should have nothing to worry about.

Toads are creatures of habit: If they find a home they like, they might stay more than a decade. "People want to know if they have the same toad coming back night after night or even year after year," says Benard. "If you look carefully, they have unique spot patterns on their back that can let you identify one individual from another."

When her children were young, Berger recalls a toad — or maybe several of them — that was the long-term tenant of a terracotta hut in a corner of her herb garden. "The kids would go and check on it, and sometimes he'd be home and sometimes he'd be out," she says. "It was really fun for them to have this wild sort of 'pet' that they could see and interact with."

Toad husbandry isn't hard, says Della Togna, and every gardener can help make a difference. "We can see it as one person and one garden and one toad, and that doesn't feel like a big impact," she says. "But think about 1,000 of those gardens. That's a significant impact on this amphibian population and a huge contribution to citizen science and local conservation."

Kate Morgan is a freelance writer in Richland, Pa.

This story has been updated.

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