Was Jonah swallowed by a fish or a whale?

What the Bible Says About

Contradictions
-By Name
-As numbered in the SAB book

Links
-1001 CONTRADICTIONS & DISCREPANCIES in the CHRISTIAN BIBLES

Was Jonah swallowed by a fish or a whale?

Jonah was swallowed by a big fish.

Now the Lord had prepared a great fish to swallow up Jonah. Jonah 1:17

Jonah was swallowed by a whale.

For as Jonah was three days and three nights in the whale's belly. Matthew 12:40

Christian Responses: Waterrock; LookingUntoJesus.net; Annotated Skeptic's Annotated Bible: Because he had done these things on the Sabbath day (Matthew 12)