Green Frog

Quick Take

• Green frogs aren't always green, and one color variation in particular will genuinely surprise you. See color variations →
• The male green frog's mating call sounds nothing like a typical frog, as it mimics a completely different instrument. Hear about the banjo call →
• One physical feature on the green frog is so distinctive that experts use it alone to identify the species on sight. Spot the key identifier →
• Green frogs can eat small birds and snakes, and their hunting strategy is every bit as lazy as that sounds. Explore their hunting diet →

One of the most common frogs native to the eastern states and parts of Canada, the green frog can be found just about anywhere there is a body of water for it to call home. This amphibian is known for its rich green hue, but subspecies can include varying shades of brown, bronze, and even blue. The green frog is well-populated and not considered endangered despite rising pollution rates that threaten its habitat. These amphibians prefer to be alone but are known for congregating around breeding season. Green frogs are also common pets due to their calm nature and are easy to care for.

4 Incredible Green Frog Facts

• All species of green frogs tend to have a distinctive green upper lip despite fluctuating color variations.
• Males make a distinct mating call that sounds like a single banjo string being plucked.
• Females can lay between 2,000 and 3,000 eggs each year.
• Green frogs are the most common type used for frog leg dishes in the culinary world and for scientific purposes.

Classification and Scientific Name

The green frog’s most common scientific name is Lithobates clamitans, but it is also referred to as Rana clamitans. The term ‘lithobates’ is derived from the Greek words ‘litho’ and ‘bates,’ meaning ‘stone’ and ‘one that treads,’ respectively, which combine to mean ‘one that treads on rock’ or ‘rock climber.’ It belongs to the Animalia kingdom and is in the Ranidae family. Lithobates are considered to be a true genus of frogs. Subspecies include the bronze frog and the northern green frog. The northern green frog is native to northeastern parts of North America, while the bronze frog tends to be found near the northern green frog.

Appearance

Green frogs are famous for their vivid green color. They are usually light in color but can have a muddied appearance similar to that of a bullfrog. However, some green frogs can have light to dark brown tones as well as a distinct bronze appearance. Their skin can feel slimy at times but is generally smooth to the touch, unlike the warty-skinned bullfrog. Green frogs often have light yellow bellies with small, black dots scattered throughout. Some can even have tones of blue in their skin. Their bulging eyes help them to see in all directions, making it easier for them to catch prey. Due to their exceptional vision capabilities, adult green frogs are generally able to escape from a potential predator with relative ease.

As a medium-sized frog typically ranging from about 2 to 4.3 inches long, this species is relatively easy to spot near bodies of water. This is especially true since it can be found out and about both day and night. Compared to other frogs, green frogs have a larger dorsolateral ridge that extends from their eyes down the back of their bodies. In fact, many people use this feature alone to identify the species because it is so distinct. Webbed toes help them maintain their grip and swim more efficiently. Green frogs also have a larger tympanum, or eardrum, than similar species. This is especially true for males. Female green frogs tend to have smaller tympanums that are roughly the size of their eyes or smaller.

Behavior

Green frogs and their subspecies prefer to live in solitude. However, they do make some exceptions. Breeding season, which is typically in the springtime, is the time these frogs spend socializing the most. It is also common for several to live peacefully in the same area and to be found near bullfrogs as long as there is plenty of prey to catch. These frogs require easy and constant food sources as they practice a waiting technique that requires minimal movement on their part. While hunting, they prefer to sit and patiently wait for potential prey to get close enough for them to grab with their tongue or fit into their mouth.

Male frogs are known for displaying aggressive behavior when it comes to finding a mate. They often growl at other males to send a warning at various intensity levels before attempting to attack. Males emit these alert calls at different intensities to send a specific message to other males. This species is active both day and night but dormant during winter to conserve energy.

Habitat

As one of the hardiest species of frogs, these frogs can thrive virtually anywhere they have access to a stable body of water. Lakes, ponds, and even small bogs are some of the most common areas where they can be spotted. Native to the eastern half of the United States and parts of Canada, green frogs prefer areas with plenty of trees and vegetation. This dense vegetation typically provides more potential prey.

Diet

This species of frog is carnivorous. It is also flexible in its food choices. These frogs are known for eating virtually any insect or small animal that they can fit inside their mouth. Some of their favorite prey include fish, larvae, and even small birds and snakes. Green frogs use a sit-and-wait hunting tactic, so they prefer to be surrounded by constant food sources that are easily accessible.

Tadpoles prefer to eat algae and zooplankton. As they grow, they begin to consume larger insects before attempting to prey on small animals.

Predators and Threats

These frogs have plenty of predators. For starters, unhatched eggs are often consumed by aquatic insects such as leeches and dragonflies. Tadpoles and mature frogs alike are targeted by turtles, fish, and a variety of different birds. Small mammals such as raccoons and otters often consume adult green frogs as well.

The largest threat to these frogs is water pollution, which can destroy their ability to breed and thrive. Another issue is the loss of habitat due to construction, fires, and other circumstances. However, these threats are considered minimal, as this species is nowhere near extinction and programs are in place to protect heavily populated areas.

Reproduction and Life Cycle

Female frogs select a mate based solely on the desirability of a territory. Females prefer larger males, but smaller, less dominant satellite males often mate with females responding to the dominant male’s calls. Breeding season for green frogs usually occurs in the spring and can last up to three months.

The reproductive process is known as “amplexus” and consists of a male grasping a female’s back and fertilizing the eggs externally. Females first produce the eggs internally, where they are nurtured before being released. This process leaves the frogs vulnerable to predators, as they are easy prey during amplexus. Eggs are produced in clutches that vary in size. Most clutches contain between 2,000 and 3,000 eggs. The eggs may be attached to aquatic vegetation but often simply float to the water’s surface, making them easy targets for potential predators. Most eggs hatch within three to five days, though some sources suggest hatching can take up to three weeks. Adult frogs do not care for their young, making them vulnerable to a variety of different aquatic and land predators.

Once the eggs have hatched, the tadpole stage of development begins. This period of growth typically lasts up to two years, after which they develop into adult frogs. A typical adult can live up to 10 years in captivity, but most found in the wild live for six years or less. Due to their long lifespan and docile nature, these frogs are popular pets that are relatively easy to care for.

Population

The population of these frogs has remained consistent, despite industrialization and modern pollution sources, and they are classified as Least Concern. While exact figures are unknown, scientists estimate that there are at least 1,000,000 of these frogs in existence. Most green frogs reside in the eastern states in areas with plenty of trees and plant life. However, they can also be found in parts of Canada, especially Manitoba.