Crow turned out to pick only the safe part of poison frog and eat well.

There are kinds of birds with very high intelligence and birds of prey in northern Australia catch prey by multiplying forest fires as well as picking up the wooden burners to expand the fire and to kill preyKnownis. Crow's alsoUse toolsAlthough it is known as a very intelligent bird, such as, the crow in the northern part of Australia, "a foreign species of poisonToad toadIt seems that you acquire advanced techniques of "eating while preventing poison".

Clever crows have learnt how to make a meal of cane toads - Australian Geographic
http://www.australiangeographic.com.au/topics/wildlife/2018/01/can-crows-eat-cane-toads

Crow is telling Australian GEOGRAPHIC that crows are excellent not only for the height of intelligence that uses tools but also for the way it adapts to changes in the environment and makes it advantageous for you. Ohio toads distributed in the Americas were brought to Oceania and Asia for the purpose of controlling pests in sugarcane fields, but in recent years foreign trout, Toad, has been disturbing existing ecosystems, which is a problem It is.

As a toad toad is large and extremely reproductive, it is more toxic, so large animals trying to predispose are killed by poisons, such as extremely invasive alien speciesInternational Conservation Union for Nature Conservation (IUCN)Listed up "Invasive alien species world worst 100We are also ranked in. Also in AustraliaPussycatYaGiant lizard, Predators such as snakes died of the poison of the toad toad, and the number of inhabitants is drastically decreasing. However, among the crows living in the area where the Toad frog grows, there are individuals that learn how to eat avoiding the poison of the toad toad and unilaterally predispose a richly existing toad toad.

byKenneth Cole Schneider

It is the secretory gland which exists from the neck to the shoulder that the poisonous toad secretes poison, and milky white venom will come out from the secretory glands when the toad toad is dangerous. Most animals will die when they touch this venom, so predators who are not tolerant to poison will die before swallowing the toad toad.

The crow carries the prey to a place easy to eat with a beak, but when he plays the toad toad is not a body, he avoids touching the venom by adding limbs and upper eyelids. And he rolls on his back on the ground, he seems to eat only a part with thick thighs, internal organs, and poisons such as tongue with thick flesh.

This time, the crow that saw the toad toad safely in the vicinity of Klongbar Lake in the northern part of Brisbane spent about 40 minutes to eat whole toad toad. And during this demolition show, it seems that other crows watching over the surroundings was observed.


What is worrisome here is that "Was the crow that was gathering around in the end a simple bystander, or was they a learner who learned how to eat safari in the toad toad?" If the technology to eat the wild toad is transmitted to other crows, it means that it is learned culturally, the crow 's community is considered to be very advanced.

In this regard, it seems that opinion is divided among scientists, but the safe way of eating this toad is a northern territory which is a quasi-state in the northern middle part from Queensland state in northeastern Australia, and northwestern part It is widespread throughout Western Australia. It seems that this distribution is linked to the expansion of the habitat range of the toad toad, and it is thought that "a way to eat sawdust safely" from crows to crows is transmitted.

In addition, birds such as crows can be crossed in a very wide range, so it is suggested that they are more tolerant to poison than reptiles and mammals living on the land. Even if it does not go to the crow of the American continent that is the origin of the toad toad, Australia's crow that genetically links with the Asian crow that resists toad poisons in toad because there are toads in the natural world in closer Asia Is naturally more toxic to poison than other predators.

byEnrique López

Unfortunately, while being struck by the crow, Oyakoda spreads the hand of invasion to the continent of Australia. Predator animals that have drastically decreased by the toad toad tend to have a tendency to recover because of learning that "a toad toad is dangerous" after a certain period of time. However, it still remains a threat to native species, and the disorder of the ecosystem caused by the toad frog will continue to expand.