Sixty little penguins have been found with their heads missing on a beach, while around 20 gannets have been discovered nearby covered in puncture marks.
Some sea lions have been found with gunshot wounds and other evidence of human interaction.
About 90 percent of animals found trapped in the shark nets weren't from the three species they are designed to capture: great white, tiger and bull sharks.
"Aww the cutest thing I saw today," said a user on Instagram.
The seal was discovered a day after a local uploaded a video of a shark attacking a sea creature at Nantucket, Massachusetts.
Viewers were delighted by the aquatic encounter in the viral clip, with one describing the marine mammal as "the puppy of the sea."
"My goal with these videos is to show people how beautiful these animals are, and why we need to protect them," the teenage diver told Newsweek.
"People getting close or touching their pups can lead to a disruption of the bonding between a mom and her pup," one expert told Newsweek.
The seals are thought to have been exposed to domoic acid after a red tide algal bloom, which can cause brain or heart damage.
A daughter's video of her French mother forgetting the English word for "seal" has gone viral on TikTok, with one user writing, "Labrador of the ocean."
The New Zealand sea lion, named Paige, had been previously spotted nearby and even had to be removed from a road.
The lost Cape fur seal was found in the middle of the road, causing traffic to stop.
Officials said there were no signs of violent death and no remains of fishing nets found.
The sea lions are getting sick from leptospirosis, a bacterial infection that can spread between mammals via urine.
The seal has become a local celebrity after it was first noticed on September 15, and has evaded capture since.
The heart-stopping footage shows the highly synchronized orcas creating a huge wave to dislodge their prey.
A woman in Hawaii who remained in the water when a monk seal and her pup were passing through was attacked and injured by the mother seal.
A seal has been caught on film using a man-made mussel farm to hide from a pursuing orca pod off the Scottish coast.
The seal pup was malnourished when authorities first rescued it in Argentina.
"These are opportunities to learn what we can do to better protect whales, we don't have many opportunities to see and learn about orcas off the Oregon coast."
"Camo Sharks" kicks off National Geographic's upcoming Sharkfest extravaganza.
Noise pollution underwater has been likened to a nightclub, with seals and porpoises having to "shout" at each other to be heard, according to new research.
The great white sharks gather to feast on an abundance of seals in the area.
Whale watchers and marine ecologists have reported multiple daily sightings in spots including Sea Lion Caves and Gold Beach.
"Our officers were able to detain the seal until the seal was taken into custody," the Southampton Town Police Department said.
The dolphin carcass was found weeks after a great white shark sighting on a nearby beach.
Scott Thompson wondered if the seal was saying "Keep going, dude" with its nudges, after he fell into the Santa Barbara Channel.
An animal rescue center said the young seal likely swam 400 miles from its birthplace in Maine.
A spokesperson for Cleethorpes Wildlife Rescue told Newsweek the seal "put up a good fight to protect itself when we got him."
A nonprofit said the grey seal pup was underweight and had a fresh bite wounds on its abdomen.