Dolphins

It is not uncommon to see dolphins coasting behind the crashing waves. Many times they travel close to the shore. While dolphins are practically harmless to humans, they can signal that there is a shark near. Dolphins are one of the few sea animals that are able to scare off sharks with their vocal abilities; however, sharks and dolphins often vie for the same fish. So while watching the dolphins is beautiful and fun, it's best to do so out of the water.

Jumping Fish

Similarly to the dolphins, schools of fish swimming close to the shore in the same direction can also indicate that a predator is near. Sometimes this predator is just a bigger fish, but sometimes it can be something a bit more sinister. One or two fish is nothing to worry about. It is nearly impossible to swim in the ocean without running into a least one living creature, but a school of fish traveling together can signal there are other larger creatures lurking nearby.

Time of Day

Sharks are more likely to be on the prowl at dawn and dusk. Naturally, these times are more dangerous for swimming because it is nearly impossible to see if anything is lurking below. Avoid the waters during these times to ensure safety for you and your loved ones!

Piers

Sitting on the pier and watching the ships go by in a beach staple. But swimming near the pier can be dangerous. Since a lot of beach-goers like to stand and fish off the side of the pier, its not uncommon that sharks and other predatory fish will find their way to the pier. Basically, if someone is fishing, steer clear.

Diving Birds

It's fun to watch the seagulls dive down and scoop at the water, but it can also be a warning sign that other predators are nearby. Just as it is with jumping fish, large schools of fish can indicate a larger predator is nearby.