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Anonymous
>>209666 Both cats and dogs can and do see colours, just not all of them. They can discern between blue and yellow (but not red and green). In fact this goes for almost all mammals, there are only a few species that are truly color blind, and most of them live in the sea. Birds can see colours better than humans and reptiles almost as well. Some birds probably see colours that just seem like shades of gray to humans.
So, most animals that have bright colours to signal their poisonous nature are preyed on by birds, which can see the colours very well. Anything with yellow or bright blue colouring will also be seen by almost any animal. In the case of reds and oranges, there's usually stark enough contrasts that anything that might eat it will notice the warning signs.
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