1. Brain: Tigers have a complex and highly developed brain responsible for various cognitive functions, including intelligent hunting behaviors and social interactions.
2. Heart: Tigers have a four-chambered heart similar to other mammals. It pumps blood throughout the body, providing oxygen and nutrients to all tissues and organs.
3. Lungs: Tigers have well-developed lungs with a large respiratory surface area, allowing for efficient oxygen exchange during intense activities such as hunting and chasing prey.
4. Digestive system: Tigers are obligate carnivores, and their digestive system is adapted to process and extract nutrients from meat. It includes structures like the esophagus, stomach, intestines, and liver.
5. Teeth: Tigers have specialized dentition, including sharp canines up to 10 cm long, which they use to kill prey and cut through flesh. They also have molars for shearing meat.
6. Muscles: Tigers possess powerful skeletal muscles that enable them to generate tremendous strength and speed. They can reach bursts of speed up to 65 kilometers per hour (40 mph) over short distances.
7. Skeletal system: Tigers have a robust and flexible skeletal system, providing support, protection, and aiding in movement. Their long tail acts as a stabilizer during hunting and maneuvering.
8. Liver: The liver plays a vital role in detoxification, metabolism, and storage of essential nutrients. It is particularly important in processing the high amounts of protein and fat in their diet.
9. Reproductive organs: Male tigers have testes located internally, while females have a uterus and ovaries. Tigers are sexually mature at around 3-4 years old and typically mate during specific times of the year.
It's important to note that these are just some of the key internal features of tigers. Their internal anatomy and physiology are complex adaptations that enable them to survive effectively in their natural habitats and excel as proficient predators in their ecosystems.