They hiss.
They are also brightly colored, and have a tail that looks quite a bit like its head so predators don't know which end to attack.
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Orange, black and if albino then black and white.
Alpacas can and often do live with llamas in captivity. Many people keep at least one llama in with their alpacas to protect them from & warn them of predators, as llamas are more inclined to fight off predators and protect their herd than alpacas.
Rottweilers that are used to protect livestock, would have to be fearless, to warn off predators like wolves and bears in some countries. Most Rottweilers are kept as pets these days, so natural predators would be other dogs.
Monkeys in general, including proboscis monkeys, are not designed to fend off predators. Instead, they live in the trees where most predators can't access them. In the case that they were attacked by a predator that could get to them, they would flee rather than fight. Also they have certain noises like a screech or honk that warn others.
Emperor penguins defend themselves by huddling together in groups to keep warm and protect against predators. They also use swimming speed and agility to evade threats in the water, and can vocalize to warn off potential predators.
To warn you to back off.
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Puffer fish are actuall tiny little fish, when they see danger the puff up and they have spikes to protect themselves against predators. They are also very poisonus.
The fluff out their feathers to keep themselves warm. Their feathers are like an instant blanket.
Male cichlids protect their fry from predators by fighting off any potential predators.*
Aposematism