You always have your IP rights. What you can do is not allowing people to create more of those bird houses.

No, I'm exactly the opposite. I do not approve of this and I think that the main compliment for the artist is when his idea is spreading.
Therefore, I am glad if someone will create their own characters. But it will be disappointing if someone shows the right to it as a species.
I just will be interested to hear the thoughts of other people on this issue.

It's an interesting question. It may depend on the motives of the people who created the concept or the species.

Was it created to help them hold onto feelings for someone or something, a replacement or a way to honor something that was lost?

Was it created because it came to them in a flash and they were excited by the idea and chased it, and want to see what others can do with it?

Why do artists create anything? There are probably very many answers, and very many attitudes.

Really a lot

It's not that my species is closed, it's just that I haven't published enough info and they all kinda look the same, so nobody wants to use them. XD

I wouldn't worry about it dude. The truth is, with as many artists and as much media and content as there is out there (millions and millions and millions of ideas and images), these original species that creators make have probably already been done by others before them. Not to say that there's anything wrong with that, it's just inevitable that there will be overlap. Fact is every artist is influenced, consciously or not, by the vast ocean of media around them; and even if not, it's still very possible that two sources in a vacuum will have similar or identical ideas.

Though there's no hard rule in art that certain ideas are only to be expressed by a certain party or individual, it's general etiquette to respect the source of a novel idea so far as respecting the creators wishes towards its usage or, at the least, giving credit to the original source. But the line gets kind of blurred when we try to determine where originality starts. I mean, you've put a structure on a large avian. Is it cool? Hell yeah. But at the same time, the concept isn't deep; you've combined two universal ideas into one semi-novel one. In this case I think the originality stems from the execution rather than the concept, and a claim to such a general concept is invalid.

Honestly, my ideas on this are still not organized to the level they probably should be to offer advice on this, and I'm not entirely sure why I crawled out of my hole to comment, but I guess my bottom line is that you shouldn't always worry about what ideas some individual lays claim to. It's good to have a healthy level of respect for others work, but at the end of the day, art is just a physical expression of ideas, and ultimately no one can tell you what ideas you can and cannot express. Its up to you to decide where to draw the line, and I think in this case, you're completely OK to continue your work on your Bird-Houses. Whether you've taken the idea from another artist or your experiences or other inspirations, you've made it something of your own.

I never seen thing kinda this before. This is not just a house built on bird. This is something like a golem. The magical union of living and nonliving matter. Wood, metal and brick, and even furniture inside, are part of the body of this creature.

I agree with your stance on it. Intellectual property is a bullshit concept that comes from capitalism and has *nothing* to do with art. Don't worry about it though, just keep doing your thing. Because, some people may say "do not steal" but i don't think they can back this up legally- it's not like anyone is actually getting a lawyer to copywriter their 7 dicked jellyfish and it's not like any lawsuit around this would stand up in court

IP, like every fictional species, is made up, and it's only real insofar as everybody acts like it is. Now, if somebody asks me not to draw something of theirs, I'll probably respect that. But I don't expect the world at large to care if I say "please don't draw gryphons with red feathers and antenna-plumes without my permission."