What is the Opposite of Nocturnal?

Let us define first what is nocturnal?

noc·tur·nal

[nok-tur-nl] 

–adjective

1. of or pertaining to the night.

2. done, occurring, or coming at night: nocturnal visit.

3. active at night: nocturnal animals.

4. opening by night and closing by day, as certain flowers. 

(source: dictionary.com)

Now,  what is the opposite of Nocturnal?

Answer: Diurnal is the opposite of nocturnal. It describes animals that are active during the day.

Example of animals that are active during night time: