"In French parks, you can see red squirrels."
Translation:Dans les parcs français, on peut voir des écureuils roux.
Because, in French, squirrels are not red. If you say red squirrel (or red hair in general), we will think of the color of the tomato, which is not the actual color of red squirrels or red hair. Generally, when referring to hair or fur, we use roux/rousse which is a color between red and orange and is sometimes translated as ginger.