Discovering the World of Poison Dart Frogs: Colors, Toxins, and More
Poison dart frogs, also known as poison arrow frogs or dendrobatids, are renowned for their vibrant colors and fascinating adaptations. Let's delve into the captivating world of these amphibians, exploring their unique characteristics, behaviors, and the source of their infamous toxicity.
Identifying Poison Dart Frogs
Poison frogs are easily recognizable by their striking colors and patterns, which serve as a warning to potential predators. These colors, often red, orange, or yellow, are examples of aposematic coloration. Aposematic coloration usually involves red, orange or yellow. If a predator finds a certain kind of amphibian to be distasteful, it will associate the warning color with the bad taste and, after one or more such experiences, will recognize the distasteful species and refrain from attacking. While the term "poison dart frog" is widely used, it's important to note that the three documented species that indigenous community reportedly rubbed their arrow tips on the frogs' backs before hunting belong to the genus Phyllobates, not Dendrobates, which includes many of the most brightly colored frogs that are most often recognized as poison dart frogs.
The Source of Their Poison
These frogs are commonly known as poison arrow or poison dart frogs because indigenous community reportedly rubbed their arrow tips on the frogs' backs before hunting. Poison frogs are known for their beautiful colors, and amphibians that have toxic skin secretions tend to have bright warning colors or patterns. Scientists believe that poison frogs gain their poison from a specific arthropod and other insects that they eat in the wild and that these insects most likely acquire the poison from their plant diet. At the Zoo, they are fed small crickets, bean beetles, black worms and/or fruit flies daily and as a result, are not poisonous.
Communication and Courtship
Most species of frogs have well-developed vocal structures capable of producing a variety of sounds that serve to attract mates, advertise territories or express distress. Sound production is often the most common form of communication in animals that jump or fly because they would otherwise have a difficult time communicating by scent. Frogs produce sounds using their laryngeal apparatuses (larynx/vocal chords) and most males have vocal sacs that function as resonating chambers. Poison frogs can be heard calling in the flooded forest. Poison dart frogs display elaborate and diverse courtship behaviors. In general, the male will lead the female to a site that he has chosen to lay the eggs. Courtship behavior can last for several hours and normally, the pair visit several deposition sites before they start mating.
Reproduction and Parental Care
Most of these species of frogs deposit their eggs inside leaf-litter, where it is dark and moist. At the Zoo, keepers make an artificial breeding "hut" for the frogs. Poison frogs' clutch size varies between species from one to 40 eggs per clutch. After the eggs are laid, the male fertilizes the clutch. However, in some species, the male releases his sperm before the eggs are laid. After about ten to 18 days and depending on the species and temperature, the eggs have matured into tadpoles. Either males or females remain with, or periodically visit, the nest. All poison frog species carry their tadpoles on their backs. The adult sits in the remainder of the gelatinous egg clutch and the tadpoles will wriggle up the hind limbs and onto the back. The adult carries the tadpoles to a small stream, pool or other small body of water. Some species transport whole clutches at one time and are completely covered with tadpoles, others transport them one by one or only a few at a time.
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Diet and Tadpole Development
Poison frogs feed mostly on small insects such as ants and termites, which they find on the forest floor. Many species capture their prey by using their sticky, retractable tongues. Most species have omnivorous tadpoles that will eat all sorts of food from algae and detritus to insect larvae and dead insects. Some species tend to be more carnivorous (such as the tri-colored poison frog) and eat insect larvae and other tadpoles.
Longevity
Poison frogs in general can live for over ten years in human care.
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