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Ocean giants

• POSTED ON: 31 Oct, 2024
• TOTAL VIEWS: 205 Views
• POSTED BY: Bhavya Venkatesh | Text: Sony BBC Earth
• ARTICLE POINTS: 150 Points

Marine mammals show incredible intelligence and adaptability to life in the water. Whether it is diving deep like sperm whales or collaborating like dolphins and sea lions, they remind us of the wonders of Nature. Protecting their habitats and ensuring a safe future for these ocean giants is crucial. By learning about them, we can help keep their world healthy and thriving.

As you read about these fascinating creatures, solve the shuffle puzzles to unravel their images.

One of the most fascinating marine mammals is the sperm whale (Physeter macrocephalus). It lives in the deep ocean, in inhospitable environments that demand extreme adaptations for survival. They can dive nearly a mile underwater and stay submerged for over an hour without coming up for air. They are experts at navigating and hunting in the cold, dark waters and have evolved to conquer harsh conditions.

Bottlenose dolphins (Tursiops truncatus) are found in the shallow waters of Florida Bay, where an abundance of fish presents both opportunities and challenges. Their large tail, designed for powerful swimming, requires them to adopt a side-swimming technique to move effectively in the less than one-meter-deep water. To catch fish, they employ an ingenious hunting strategy of churning the water by beating it with their tails and creating a muddy barrier that forces fish to leap into the air, making it easier for them to catch their dinner. They also use an S-shaped barrier to spook fish, showcasing intelligence and adaptability.

Humpback whales (Megaptera novaeangliae) are strong swimmers as soon as they are born. They migrate to find food, embarking on a journey fraught with danger from predators like orcas (Orcinus orca). Since the ban on commercial whaling, humpback whale populations have surged from a few hundred to over 35,000. However, this has made them targets for orcas that specialise in hunting their calves. A small pod of orcas will take advantage of a mother’s momentary distraction to lead the calf into their slipstream before attacking. During migration season, orcas can kill as many as five calves a day, illustrating the brutal efficiency of Nature when prey is abundant. But, humpback whale cows are fierce protectors, always ready to defend their calves.

On the Pacific coast of Mexico, Californian sea lions (Zalophus californianus) are masters of the ocean. They strategically wait for the striped marlin (Kajikia audax) to herd schools of sardines into tight balls, allowing the agile sea lions to rush in for a feast without expending much energy. In the Galapagos Islands, pregnant Galapagos sea lions (Zalophus wollebaeki) come ashore to give birth, with the newborn pups relying entirely on their mothers for nourishment. As the pups grow they initially find safety in sheltered inlets but also face dangers from predators, particularly sharks lurking in the surrounding waters. A young pup that strays too far from the safety of its rock pool may encounter a shark. If it is fortunate, the dominant bull sea lion may intervene, showcasing its protective instincts and strength, to save the pup. Even so, nearly half of the young sea lions do not survive past their second year.