There is no simple answer to "what animal is tougher than a bear" because "toughness" is subjective and depends on how you define it.
Different Types of Toughness
Physical strength: Bears are strong, but a hippopotamus or elephant could overpower them.
Endurance: A wolf may not be as strong, but can chase prey much longer.
Resilience: Crocodiles or sharks can survive injuries that would be fatal to others.
Aggression: Tigers or polar bears may be more aggressive and predatory.
Defensive capabilities: Porcupines or skunks are dangerous despite lacking strength.
Important to Remember
Context matters: A grizzly bear might be tougher than a lion in Alaska, but the lion might win in the African savanna.
Animals are not machines: Individual strength, resilience, and aggression vary by age, health, and experience.
Rather than seeking a definitive answer, it is more interesting to explore the unique strengths and weaknesses of different animals.