No, it would not be possible for a human to strangle and knock out a giraffe due to several reasons:
Size and strength: Giraffes are enormous animals, with adult males weighing up to 3,000 pounds (1,360 kg) and standing around 16-18 feet (4.8-5.5 meters) tall. Their muscles and bones are adapted to support their large bodies, making them much stronger than humans.
Neck anatomy: While giraffes have long necks, their necks are also incredibly thick and powerful to support their heavy heads and allow them to reach high into trees for food. Strangling a giraffe would be practically impossible for a human due to the sheer size and strength of their neck muscles.
Natural defenses: Giraffes have evolved to defend themselves against predators, and they can deliver powerful kicks with their long, strong legs. A human attempting to get close enough to the giraffe's neck would be at risk of severe injury from these kicks.
Ethical concerns: It is essential to respect and protect wildlife. Attempting to harm or knock out a giraffe or any other animal would be unethical and illegal in most places.
Interactions with wild animals should always prioritize safety, conservation, and respect for the natural world. Instead of contemplating harmful actions, it's better to appreciate and learn about these magnificent creatures from a safe and respectful distance, such as through wildlife observation and conservation efforts.