We need to translate visible text content while preserving HTML tags exactly. So we must output same HTML structure, but text translated to Japanese. Must keep tags, attributes, etc unchanged. Ensure no extra text. Let's go through each element. Original:

Bull Sperm Whales are massive predators. With their large brain, sharp teeth, and sonar abilities, they possess excellent hunting skills that guarantee their success in catching jumbo squids, sharks, and other sea creatures.

Translate: "雄のマッコウクジラは巨大な捕食者です。大きな脳、鋭い歯、ソナー能力を備えており、巨大イカ、サメ、その他の海の生物を捕らえる成功を保証する優れた狩猟スキルを持っています。" Check nuance: "Bull Sperm Whales" maybe "雄のマッコウクジラ". Good. Next:

 Bull sperm whales have been observed to attack and intimidate pods of orcas. They are some of the few animals orcas stay away from as they are large and mighty. However, orcas do target their calves and feeble adults