Animals are a huge part of this world. And sea animals are quite important for the entire environment and nature.
Let’s find out more about them!
- Sharks are a group of elasmobranch fish.
- Sharks are characterized by a cartilaginous skeleton.
- Modern sharks are classified within the clade.
- The term “shark” has also been used for extinct members of the subclass Elasmobranchii.
- The earliest known sharks date back to more than 420 million years ago.
- There are almost 500 species of shark.
- Well-known species of sharks are the tiger shark, blue shark, great white shark, mako shark, thresher shark, and hammerhead shark.
- They are apex predator organisms.
- They are at the top of their underwater food chain.
- Shark embryos attack each other.
- Sharks have a sixth sense.
- Also, they an intensive sense of smell.
- Hammerhead sharks also have 360-degree vision.
- The longest fish in the world is a type of shark.
- Its the whale shark.
- It is 40 feet long.
- In general, sharks need deep water, so they live in the oceans.
- But some kinds of sharks inhabit freshwater lakes and rivers.
- Some sharks are pregnant for two years.
- The species of great whites have a more powerful bite than jungle cats.
- Great whites have a more powerful bite than jungle cats.
- The same stands for hippos, deer, and cows.
- Female sharks can reproduce without male sharks.
- Sharks prefer to attack men.’
- Sharks do not have bones.
- Sharks’ skeletons are made of pure cartilage and muscle.
- Sharks need to keep swimming in order to breathe.
- So they don’t sleep, but instead, they stay semi-conscious.
- Sharks are considered older than dinosaurs.
- Sharks grow up to 50,000 teeth in a lifetime.
- The goldfish is a freshwater fish.
- It belongs in the family Cyprinidae of order Cypriniformes.
- It is one of the most commonly kept aquarium fish and many people -especially kids- own it as a… pet!
- In fact, goldfish (along with dogs and budgies) have been kept as pets longer than any other animal.
- Over 480 million goldfish are sold every year!
- As a species, it was “born” in ancient China more.
- It was bred more than 1,000 years ago.
- Since then several distinct breeds have since been developed.
- Goldfish breeds vary greatly in size, body shape, fin configuration, and coloration.
- Various combinations of white, yellow, orange, red, brown, and black are known.
- But if you keep a goldfish in the dark, it gets… white!
- That’s because light helps the goldfish to produce pigment in their skin.
- Goldfish lives more than any other domestic fish.
- The oldest goldfish (on record) made it into his mid 40’s.
- For every year of a goldie’s life, the fish develops a ring on its scales!
- Those rings are called circuli.
- In case you need to see the circulis of a goldfish, you need a microscope.
- Goldfishes are able to see more colors than… humans!
- The human eyes can see a combination of the 3 primary colors (green, red, and yellow), whereas goldfishes are able to see the combination o 4 primary colors.
- For instance, they can see ultraviolet light.
- This helps them see movement in the water and find food easier.
- The 3-second memory thing is a total myth.
- Goldfishes have a sixth sense!
- You may have noticed a row of tiny dots down each side of your goldfish.
- That’s an actual organ and it’s called the “lateral line.”
- It can actually give a goldfish the ability to feel pressure changes in the water like vibration and currents.
- A goldfish will eat whatever fish fits in their mouth.
- No exceptions- that includes their own babies.
- They will even eat their own poop, so when we say they can eat anything we mean literally anything.
- You can tell a male goldfish by the breeding stars.
- Scientists don’t know why these breeding stars are on their skins.
- Some people though believe they exist for impressing females.
- Goldfishes can recognize faces, shapes, colors, and sounds!
- When given a goldfish as a gift, it used to be a sign of good and strong friendship.
- In Asia, it used to be a gift from the husband to his wife to their first anniversary.
- At one point in China’s past, only royalty could afford the luxury of pet goldfish.
- By using food as a reward, goldfish can learn to do all kinds of tricks like pushing a ball through a hoop, playing soccer and go through an obstacle course are just some of what they can learn!
- Goldfishes don’t have stomachs.
- Instead, they have one long intestine that does the job of digesting in different areas.
- Goldfish can’t close their eyes, but they sleep without closing their eyes.
- Dolphin is a common name of aquatic mammals.
- There are 44 extant species named as dolphins.
- Males are larger than females.
- They live anywhere on the planet, but in general, they prefer warmer places such as the Mediterranean sea or the tropic zone.
- Dolphins live in the sea, but can’t breathe underwater.
- They swim up to the ocean’s surface to get air.
- They rest one hemisphere of their brain for 15 to 20 minutes at a time.
- They take these “naps” several times each day.
- This is how they breathe and look after themselves all day long.
- Dolphins communicate making a variety of vocalizations.
- While “hunting down”, they make clicking sounds.
- They communicate with other dolphins by whistling.
- Dolphins also create very loud sounds when they feel excited or aggressive.
- One of their biggest enemies is the shark!
- Scientists haven’t linked their vocalization to their general behavior yet, so they are considered mysterious animals.
- To know where they are in relation to other objects and animals, dolphins use echolocation.
- This is a biological sonar.
- More simply they talk and then they hear echoes in order to understand where they are.
- They are carnivores.
- Echolocation is also used by them to trap, catch, and eat fish and squid.
- Dolphins are quite social and create friendships.
- Every dolphin has its own whistle.
- That’s somehow their name.
- Marine scientists believe that female dolphin may even teach their baby dolphins their whistles before they’re born.
- Dolphins use their unique whistles to call out to one another.
- In addition, they are able to remember other dolphins’ whistles after decades apart.
- The largest dolphin species is the Orca, which is also called Killer Whale.
- It can be 30 feet long—10 times longer than the smallest dolphins.
- Dolphins do have teeth but don’t use them to chew food.
- They only use their teeth to catch their food.
Got anything to add?