Duckling sleepy after eating duckweed/ant bite?

[Brex]

Our little duckling Charlie is about 12 days old and has been expanding his cuisine!

He has recently discovered the side pond is full of tasty duckweed, but after having a small portion seems to become very sleepy?!
It's still a big run out to the side pond for the little guy, so it may be he's just somewhat exhausted, but I'm not convinced...

Does anybody know of similar behavior from ducks or ducklings eating duckweed?

---Edit---
I've just remembered that he was also bitten by an ant today...
I wonder if this could have had some kind of paralysing effect because the little guy seems to sit down all the time even when picked up.
He lays down with his head to the floor but keeps his eyes open, peeping softly.

Slightly worried now

 

[Enchanted Sunrise Farms]

My blanket response to any of my chickens or ducks looking off is to bring them inside in a cage and put a heat lamp on them. Provide plenty of fresh water and healthy food, like chopped hard boiled eggs, and give them time to recover.

Is this duckling being raised by a mom? If not, 12 days is a little early to be out and about.

 

[Brex]

Well he seems to be much better now,...
He seems to have been in a bit of shock at the ant bite poor thing!

Yes I agree he is too young to be out doors, I shall make sure he's not taken outside for from now on!