Why are St. Bernard and poodles considered the same species?

St. Bernards and poodles are not considered the same species. They are both dogs, belonging to the same species, *Canis lupus familiaris*, but they are different breeds.

Here's the breakdown:

* Species: A group of organisms that can interbreed and produce fertile offspring. All dog breeds belong to the same species, *Canis lupus familiaris*.

* Breed: A group of animals within a species that have been selectively bred for specific characteristics, such as appearance, temperament, or abilities. St. Bernards and poodles are distinct breeds with different physical traits, temperaments, and histories.

Think of it like this: You and your sibling are both human beings (same species), but you have different physical characteristics (different breeds) like eye color or hair color.