Here is a concise summary of the provided text, highlighting the various shark species and their unique characteristics:
**Summary:**
The text showcases 10 unusual shark species, each with distinct features:
1. **Cigar Shark**: Glowing neck, small (cat-sized), feeds on large prey at night.
2. **Big Mouth Shark**: Enormous mouth, filter-feeder, harmless to humans.
3. **Fox Shark**: Large tail, uses tail to hunt and defend, doesn't attack humans.
4. **Angel Shark**: Flat, wing-like fins, powerful jaws, prefers small fish.
5. **Horn Shark**: "Horns" above eyes, nocturnal, feeds on sea urchins and crustaceans.
6. **Elf Shark**: Ugly appearance, long nose, slow, sneaky hunter of squid.
7. **Ninja Lantern Shark**: Glows, small, sharp teeth, unknown reason for bioluminescence.
8. **Hammerhead Shark**: Wide field of vision, feeds on stingrays, can weigh up to half a ton.
9. **Frilled Shark**: Eel-like movements, many sharp teeth, swallows prey whole.
10. **Mako Shark**: Fastest shark (up to 55 km/h), warm-blooded, thrives in cold waters.
**Additional Mentions:**
* **Serra Shark**: Long, flat, thorny nose with electrical receptors for sensing prey.
* **Swordfish** (not a shark, but mentioned for comparison): Extremely fast (up to 90 km/h), uses special oil for high-speed gliding.
Here are the key facts extracted from the text, numbered and in short sentences:
**Shark Facts**
1. **Cigar Shark**:
* Found 3 km deep in the sea
* Has a bright green, glowing neck
* Small, about the size of a cat
* Has brown skin and large green eyes
2. **Big Mouth Shark**:
* Approximately the size of a car
* Only 100 individuals have been seen
* Has a huge mouth, but is not dangerous to humans
* Feeds on plankton and small delights
3. **Fox Shark**:
* Has a huge tail, almost the size of its body
* Uses tail to hunt and defend itself
* Does not attack humans
4. **Angel Shark**:
* Has fins resembling wings
* Flattened body like stingrays
* Skin patterns aid in camouflage
5. **Horn Shark**:
* Has two horn-like protrusions above its eyes
* Not aggressive, relatively fast
* Favorite foods: sea urchins and crustaceans
6. **Goblin Shark**:
* Has a long tail and a very long nose
* Lives in deep sea, prefers squid as food
* Has a unique, extendable jaw
7. **Ninja Lantern Shark**:
* Glows in the dark, possibly to attract prey or communicate
* Black skin, almost invisible in dark
* Small, about the size of a human arm
8. **Hammerhead Shark**:
* Can weigh up to half a ton
* Lives in tropical waters worldwide
* Eyes on the sides of its head for wide-angle vision
9. **Long-Lived Shark (possibly Greenland Shark)**:
* Can live for 300 to 500 years
* Found in North Atlantic and Arctic oceans
* Uses its sense of smell to find food in dark depths
**Other Sea Creatures**
10. **Stingrays**:
* Camouflage themselves to blend with the sea floor
11. **Swordfish**:
* Can swim up to 90 km per hour
* Has a special gland producing oil for high-speed gliding
**General Shark Facts**
12. **Most Sharks**:
* Are omnivorous, eating a wide variety of sea life
13. **Bonnethead Shark**:
* Unusually, eats algae for about half of its meals
14. **Frilled Shark**:
* Swims at the ocean bottom, moves like a snake
* Has about 200 strong, sharp teeth
15. **Serra Shark**:
* Has a long, flat, thorny nose with constantly growing teeth
* Electrical receptors in its nose aid in sensing prey