Looking on the internet deeply has found these results:

we saw a otter is the most popular phrase on the web.

we saw an otter 1568 results on the web	we saw a otter 15,530 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
Then one day at about 5pm we saw an otter – not a huge one – right in front of the cottage about eight feet from the garden, swimming on its back..." Now here's ... "This year's excitment, we saw an otter! Another wonderful holiday in Sgreadan, Colonsay lobster and oysters superb, as always we look forward to next year. Today we saw an Otter but typically it played hide and seek with us before it eventually appeared on the top of a rock and promptly went to sleep as the tide ... "Thank you so much for a really wonderful day. You put so much thought and effort into the walk and the food! We saw an otter, Bottlenose Dolphins and a ...	It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

we saw an otter

1568 results on the web

we saw a otter

15,530 results on the web

More popular!

Then one day at about 5pm we saw an otter – not a huge one – right in front of the cottage about eight feet from the garden, swimming on its back..." Now here's ...
"This year's excitment, we saw an otter! Another wonderful holiday in Sgreadan, Colonsay lobster and oysters superb, as always we look forward to next year.
Today we saw an Otter but typically it played hide and seek with us before it eventually appeared on the top of a rock and promptly went to sleep as the tide ...
"Thank you so much for a really wonderful day. You put so much thought and effort into the walk and the food! We saw an otter, Bottlenose Dolphins and a ...

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.