@Eeveeinheat  
In many senses, they are especially orcas. Orcas have defined structures, a language that does actually vary depending on the society and location, different sorts of hunting and behavior that rely on the ecosystem around them (showing a very good sense of adaptation) and have one of the largest brain to body ratios of mammals.
 
Yeah, that is true. They could possibly learn but again, I think the communication barrier is a bit too much since I sincerely doubt either could speak the other’s language.

@FlonnesIkramant  
Fun fact: there is evidence that Dolphins may actually be sapient, but just can’t do anything with it because their language centers are not useful for our kind of society. Not to mention their lack of hands. That is a deal breaker, too.

I’m scared of spiders and flying insects are annoying so this would go on the long list of reasons I’d never want to live in Equestria.

@Eeveeinheat  

@FlonnesIkramant  
You’re triggering me so hard. And it’s totally on purpose.

@FlonnesIkramant  
Also when I say sentience I actually mean sapience. You can easily get them confused. A dog or dolphin is sentient because it can experience things and emote. A human or changeling is sapient because it can think and reason.

@Background Pony #4F62  
Ok, I will spell it out for you:  
Humans (Homo sapiens) are mammals which is a class of animals yet they are not seen as animals because they are sentient.  
They share certain features with other mammals. Technically there are other members of the subtribe Hominina which aren’t animals either but unlike them we are not extinct so we commonly refer to fleshly beings either as animal or human.  
Changelings seem to be insects which is a class of animals yet they are sentient so they would not be considered animals.  
As long as they share certain features with other insects they will be classified as such, tho.  
None of the class of insects features exclude sentience.

@FlonnesIkramant  
Insects are animals dude.

@Background Pony #4F62  
It says insects not animals. We are mammals and also not animals. Think about it.

@FlonnesIkramant  
Changlings are sentient beings not animals.
 
@RedMagePony  
One off joke that went no where and Weren’t dangerous enough to make the list.

i wonder what happened to the Star-Spiders…

Twittermites? They really could have called them “Lightning Bugs” and it would have fit just fine.

If you think about it, Equestria is sort of a magical Australia, where everything is trying to kill you.
 
Don’t mess with ponies. This is their home environment.

If you think the changelings were bad…

@laofuzi
 
The Equestrian Research Council concluded they were bad for the environment. Some suspect the group was a changeling front organization.

Changelings could classify, too if you think about it.
 
@laofuzi  
Bug spray could save lives!

Have ponies not heard of bug spray??