Donate
Donate
The Dolphin Project

Estuarine Bottlenose Dolphins

About Estuarine Bottlenose Dolphins

Bottlenose dolphins (Tursiops truncatus) are found in a wide range of habitats, from shallow coastal estuaries to deep offshore waters. Scientists often recognize two general types based on where they live:

Estuarine / Coastal Dolphins

  • Live in bays, sounds, estuaries, and tidal creeks
  • Often remain in the same area year-round
  • Typically smaller in size
  • Form smaller, more stable groups

Offshore Dolphins

  • Live in deeper, open ocean waters
  • Travel over larger distances
  • Typically larger in size
  • Often found in bigger groups

The Dolphin Project studies estuarine bottlenose dolphins along the coast from Hilton Head, South Carolina, to St. Marys, Georgia, using photo-identification and long-term monitoring to better understand dolphin populations, behavior, and habitat use. This research helps inform conservation efforts and supports the protection of local marine ecosystems. 

 

Classification

Dolphins belong to the order Cetacea, which includes whales, dolphins, and porpoises. Bottlenose dolphins are part of the suborder Odontoceti, also known toothed whales.

 

Diet
Dolphins are carnivores that primarily eat fish, crustaceans and squid. They use their teeth to grasp and hold prey, not to chew. Most prey is swallowed whole. 

 

Echolocation
Dolphins use a highly advanced system called echolocation to navigate and find food. By emitting sound waves and interpreting the return echoes, they can determine size, shape, distance and density of objects. This ability is often compared to medical imaging like ultrasound. 

 

Size
Estuarine bottlenose dolphins typically grow to: 
6-8 feet (2- 2.5 meters) in length

Newborn calves are usually:
2.5- 3 feet (0.75 -1 meter) long

 

Reproduction

Female dolphins give birth approximately every 2-3 years.

Mating behavior can occur year round.

Gestation lasts about 12 months.

 

Speed

Dolphins can swim at speeds of up to 25 mph (40 km/h)

 

Lifespan
Dolphins can live from 25 to 65 years, depending on the environmental conditions and overall health.

 

Appearance
Bottlenose dolphins typically have:
A gray body, ranging from light to dark. 
A lighter underside, which can appear white or slightly pink. 


Did You Know?
Dolphins may look like they are always smiling, but this is simply the natural shape of their jaw, not an indicator of emotion. 

 

Emerging Research
Scientific understanding of bottlenose dolphins continues to evolve.

 

Tamanend’s bottlenose dolphin (Tursiops erebennus) is a species of bottlenose dolphin found in coastal waters of the eastern United States. These dolphins were previously classified as a nearshore form of the common bottlenose dolphin (Tursiops truncatus).