The following are my favorite prehistoric animals: saber-toothed tigers, dire wolves, and megalodons.
The prehistoric cousins of the modern elephant are the woolly mammoth, the mastodon, and the Columbian mammoth.
Are is a linking verb, so you don’t need a colon to introduce this list.
Steve looked at the mammoth display with Ruhi, Juan, and Andrea.
With is a preposition, so there’s no need for a colon here.
- Use a colon to introduce an illustration or restatement
- Use a colon to introduce a quotation