It depends on the type and size of the animal as well as temperature and humidity. Typically it takes 3 days before an odor is noticeable.
Dead/rotting animals smell horrid until completely decomposed. ~
~Sleenky
how long does it take before you can smell s dead animal
YES.
there could be a dead animal in your vent
...Cycle of life
A gas smell has a rotten egg odor due to a chemical gas companies use to make gas leaks easily detectable. A dead animal smell is caused by bacteria and fungus as that form as the body decays.
Most likely they smelled like whatever they walked into.
Actually it doesn't take very long for a hermit crab to smell when it's dead. They will not smell if they just died. About 10-15 mins they will start to smell. You have to put the hermit crab up to your nose in order to smell the rotten fish smell.
Its because od decomposition of the body ......
There could be a dead person or dead animal in the house, or spoiling meat as from a refrigerator or freezer. Vultures are attracted by the smell of carrion and many species have an exceptional sense of smell.
Buzzards eat any dead, decaying animal. They will eat anything that is decaying, they can smell dead animals from far away, and will circle around the dead animal and eat it. They also hang around landfills and eat decaying food.
Because part of their natural diet is carrion (dead animals). They find the carcasses by using their sense of smell - and will 'home in' on an animal from some distance away.
Bacteria and fungi attack the dead plant or animal and start breaking it down as their food.