Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_15417439_1 (common_name VARCHAR, genus_species VARCHAR)
### Question:
What's the animals name when the genus/species is rattus norvegicus? 
### Answer:
SELECT common_name FROM table_15417439_1 WHERE genus_species = "Rattus norvegicus"