There could be several reasons why you keep hearing a dinging sound in your garden, resembling the sound of leaving a car door open. Here are a few possibilities:
Wind chimes: Wind chimes are often hung in gardens and can create tinkling or dinging sounds when the wind blows. If you have wind chimes nearby, they could be the source of the sound.
Bird or insect activity: Certain bird species or insects, such as crickets or cicadas, can produce sounds that may resemble a dinging sound. Birds can make various vocalizations or mimic sounds they hear, while insects produce unique mating calls or chirping noises.
Animal behavior: Some animals, such as squirrels, can make noises by gnawing on objects or moving them around. If there are any metallic objects or structures in your garden, animals could be interacting with them and creating the sound.
Mechanical or electrical equipment: It's also possible that the sound is coming from nearby mechanical or electrical equipment, such as a malfunctioning security system, irrigation system, or even a neighbor's appliance. The sound may be carrying through the air and reaching your garden.
Psychological factors: Sometimes, people can experience auditory hallucinations, where they hear sounds that aren't present in their surroundings. If the sound persists and you've ruled out other possible causes, it might be worth considering consulting a medical professional.
To determine the exact source of the sound, it would be helpful to listen carefully and try to locate where it's coming from. Observing your surroundings and ruling out the possibilities mentioned above should assist you in identifying the cause.