The correct answer is option 2: Bat. Bats are known carriers of the rabies virus and can transmit it to humans and other animals through bites, scratches, or even saliva contact. It is important to note that not all bats have rabies, but it is always best to avoid direct contact with bats, especially if they are acting strange or exhibiting abnormal behavior.

Option 1: Donkey. Donkeys, or any other domesticated animals like cows, sheep, or pigs, do not typically carry the rabies virus. They are not known to transmit rabies to humans.

Option 3: Horse. Horses are also not natural carriers of the rabies virus. They very rarely contract rabies, and even if they do, they usually do not transmit it to humans or other animals.

Option 4: Crocodile. Crocodiles and other reptiles, including alligators and turtles, do not carry or transmit the rabies virus. Rabies is primarily found in mammals and is usually transmitted through bites from infected animals.

In summary, while dogs and bats can both transmit the rabies virus through bites, other animals like donkeys, horses, and crocodiles are not known to carry or transmit rabies.