1. Accidental injury: When a squirrel is injured, it may make sounds such as moaning, roaring, or screaming. These sounds look like cries and can also produce visual and olfactory warning effects.

2. Hungry and thirsty: If squirrels are hungry or thirsty, they may make continuous painful noises, as if they are crying.

3. Cold or lonely: Being in cold weather or being isolated without help for too long will make squirrels unhappy or even panicked. They will vocalize frequently in their leisure time to show their need for shelter or care (although This 'crying' is not actually tears falling).

4. Sleep Patterns: This may sound surprising, but the truth is that squirrels can still be dissatisfied with their sleep schedules. Because squirrels are lively and active, they will make sounds when exercising or playing. They will also constantly scream for attention when dreaming, being awakened, or having other abnormal sleep periods.

What to do if a squirrel cries:

1. It may be due to inflammation. The squirrel’s diet needs to be slightly adjusted and it should eat less nuts with high calories. You should also give it eye drops or apply erythromycin eye ointment and other drugs to reduce inflammation.

2. After discovering it, check whether there is any foreign matter in its eyes and clean it out in time.