"Pandas are black and white."

Translation: 熊猫是黑色和白色的。

[MichaelLe3139]

Can someone explain why we need 的 here please!

[DestinationVoid]

Without 的 black & white are nouns.

You need it in order to turn them into adjectives.

[elmanisero777]

can you say instead "熊猫又黑色的又白色的"?

[KX3.]

（皮毛）又黑又白 sounds more natural.
That's also more 有黑色有白色的。