But other structural tweaks across the receptor compensated for this issue. Epibatidine can't "recognize" the poison frogs' acetylcholine receptor, but acetylcholine can--sparing the frogs the effects of their own toxic brew. What's more, it turns out that the frogs evolutionarily stumbled across this resistance on at least three separate occasions, a testament to that mutation's usefulness. "This is beautiful… there is only a handful of examples [like Tarvin's study]," says herpetologist and toxinologist Zoltan Takacs, a National Geographic Explorer.
TAIPEI – Taipei Zoo has said it has successfully bred yet another species of poison dart frog, with expertise from a Japanese zoo, and expects the first batch of hatched tadpoles to transform into froglets in the coming days. Tai Wei-yu, a section chief of the zoo's Amphibian and Reptile House, said the South American blue poison dart frog is the latest species to be bred using techniques shared by Sapporo Maruyama Zoo. The zoo had already bred three other species from adults provided by Maruyama Zoo three years ago -- including the green-and-black poison dart frog in 2015, the yellow-banded poison dart frog in 2016 and the golden poison dart frog earlier this year. Tai said the Taipei Zoo has long been impressed by Maruyama Zoo's breeding programs. The two zoos signed a partnership agreement in 2013 to assist each other through sharing of knowledge and expertise.
A splash-back poison frog carries its offspring on its back in Peru. Siblings can be annoying, but for young splash-back poison frogs, they're also deadly. If placed in the same pool, tadpoles of this species will gladly eat their brothers and sisters. Now a new study suggests tadpoles have a way to escape their cannibalistic kin: Hitchhiking on the backs of adults. Female poison frogs usually lay their eggs above water-filled plants, such as bromeliads.
Male poison frogs have been observed to eat all clutches when they take over new territories. The males of this species are known to be caring fathers that care for all clutches inside their territories, even if they have not fertilized a single clutch in previous weeks. But when they invade new territories, they become cannibalistic and eat all the clutches the find to reduce the risk of investing parental care towards offspring that aren't their own. Male poison frogs are responsible for providing parental care, so when they kill the clutches of other frogs they're reducing the risk of caring for offspring that aren't theirs Cannibalism and infanticide have been observed in feline predators, primates, insects, fish and birds. Usually, animals that eat unrelated offspring do this for sexually motivated reasons.