User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-5963861-20130927031528/@comment-5963861-20130927041719

An alternate earth is most likely, other than it being a different planet. Here is a list of regular animals I've seen/heard in the series.

1. Whales singing in Tri G/3U's opening.

2.Owls hooting in the Zinogre ecology video.

3. Multiple species of birds.

4. Multiple species of fish, especially sharks.

5. The creatures Pike just listed.

6. Plenty of dinosaurs wandering around.

I think its an alternate earth where no extremely serious mass extinctions have occured.