An invasive poisonous toad, called the Asian toad (Duttaphrynus melanostictus), is rapidly spreading across the island country, threatening the survival of its rare and endemic species, scientists say. Currently, scientists estimate that there are about 4 million toads on the island...A  number of factors point towards Ambatovy mine as the probable culprit of the toads’ introduction, experts allege...Mongabay contacted Sherritt International, co-owners of Ambotavy mine, seeking responses to the conservationists’ claims. Sherritt hasn’t responded yet. Sherritt, however, told BBC Earth that they are working “to support efforts to contain and or eradicate the toads”, but have not acknowledged that the toads arrived on their containers...The toads are also a major health risk. They are known to be poisonous to other animals, including humans. For example, these toads have been implicated as the cause of multiple cases of human poisoning in their native range, and have also been associated with cardiac arrest and death in children who have consumed toad tissue...