8 aquatic animals that might be extinct in 100 years

As ocean water warms, it expands. This is partially why sea levels are rising around the world — and projected to continue doing so throughout this century. Higher sea levels can lead some beaches to disappear.

The Hawaiian Monk Seal has been severely affected by this loss of beach, as it spends about one-third of its time on land. The creatures are also suffering from a disease called toxoplasmosis, which originates in cats.

The monk seal population is reportedly declining at 4% annually; it is estimated that fewer than 1,200 individual Hawaiian Monk Seals exist. Biologists predict the number will dip below 1,000 in the next three to four years, placing this species among the world's most endangered.

The hawksbill turtle is one of the most endangered sea turtles in the world. In addition to being threatened by the now-illegal tortoiseshell trade and boat strikes, climate change also puts this species at risk of extinction.

In particular, the species could lose their habitat in areas where coral reef bleaching is occurring, like Australia, Indonesia, and the Maldives. As coral reefs continue to die, that eliminates some of the hawkbill's habitat, which means the turtle could be headed toward extinction.

Krill are tiny, shrimp-like crustaceans that are extremely prevalent and provide food to hundreds of different animals. But as the ocean temperatures rise, krill's primary food source, phytoplankton, has begun disappearing. In addition, the loss of sea ice is eliminating krill's shelter and that of the creatures they eat.

Researchers have estimated that, if warming trends continue, krill could see a 20% reduction in the area in of the Arctic they can inhabit by the end of the century.

If the population of krill starts to fall, that could threaten many ocean creatures, including the blue whale. Blue whales can eat up to 40 tons of krill a day and if krill decline or become extinct, the blue whales could lose a major part of their diet.

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Ringed seals rely on ice year-round as the place they mate, give birth, and rest. So as ice melts in the Arctic as a result of climate change, these seals will continue to lose a key part of their habitat. As the times of year that ice breaks is altered by temperature changes cause by climate change, researchers think seal pup mortality rates are likely to increase because the changing ice conditions could throw off ringed seals' schedules. Plus, warmer waters can make conditions more favorable for pathogens and parasites that can be deadly for ringed seals.

In addition, this species' diet includes krill which, as mentioned earlier, are at risk as well.

Olive-brown sea snakes' population has been decreasing in recent years and, like some other creatures on this list, they rely on coral reefs for their habitats. So, as coral continues to die following the aforementioned bleaching caused by climate change, these creatures could lose a suitable habitat as well as a lot of prey they feed upon as some of its prey also relies on coral for its survival.

This fish prefers to eat a specific species of branching coral called Acropora millepora. But coral reefs around the world are facing damage and bleaching due to climate change as the oceans continue to absorb heat that's been released by fossil fuels — and this type of coral may eventually become extinct.

Researchers have found that some of these filefish would sooner starve or attempt to eat bleached coral than eat a different type of coral. Its pickiness could lead to its eventual extinction. In addition, this filefish relies on coral that's getting bleached as a place it can hide via camouflage — that's what its orange spots are for.

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