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Greylag goose is Anser anser.Common toad is Bufo bufo.The words that link them are that Anser anser and Bufo bufo are their Scientific names.
Bufo hypomelas was created in 1913.
Bufo tuberculatus was created in 1926.
Bufo pewzowi was created in 1898.
Bufo latastii was created in 1882.