All About Elephant Eyes
- The eyeball of an elephant is similar in size to those of humans and is small for such a large animal.
- Elephants and wild pigs are the only ungulates with round pupils.
- Round pupils are normally associated with forest or shade-adapted animals.
- Elephants have limited angles of vision with a superior ability to see forward rather than sideways or backward.
- Eyesight is considered poor in bright light but in dim light movement can be detected at up to 45m.
- Although elephants shed tears, no functional tear glands are present.
- Tears exude from the Harderian gland which is meant to keep the third eyelid or nictitating membrane moist.
- Elephants close their eyes when sleeping with most sleep taking place in the early morning and in the heat of the day.
- Adult elephants can lie down to sleep but frequently doze while standing.
- Source: Dr Michelle Henley