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Bufo marinus subgenus Rhinella
These two large yellow toads had odd lumps above the front legs, which are the poison producing parotid glands. The eyes were greenish with horizontal pupils. One seemed to be covered in peeling dry mud. They were both about 10 cm long and totally ungraceful.
In a back alley behind the Highway Toll Booth outside of Arriaga, Chiapas.
Their skin contains toxic substances which can kill any animal that might eat them. They are native to the Americas but have been introduced to many areas of the world (especially the south pacific and Australia) for pest control, which was not always successful.
Thank you Ashley for the identification. I was fascinated with the history of this toad!
Hi Argy, it is a Bufo marinus. It is the first time I had ever seen one. Once was enough, so no thanks on the offer of more! :)
What a lumpy looking toad. Sure looks a lot like Rhinella marinus. Let me know if you don't have enough of them - we can send more.