How do rabbits work?

[Elk]

So, Im currently trying to do the Drow Elf challenge, and a pretty weird thing happened.

Ive started building a house, pretty deep down, and then rabbits just appeared.

Spoiler: This is how deep I am

Spoiler: And suddenly rabbits

I know that NPCs reduce the spawn rate of enemies, but do they increase the spawn rate of critters? Even still, I thought rabbits only spawned on the surface.

The thing is, this isnt the first time ive encountered rabbits deep underground. One time a while ago I was exploring the underground hallow, and I kept finding bunnies in different caves with no rabbit statue around. During that time I didnt have any NPCs living down in those caves

Spoiler: More Bunnies

Am I just cursed or is there actually a reason that im finding so many rabbits deep underground?

 

[zimberzimber]

They spawn around NPC homes.

 

[Ilmarinen]

NPC's do increase the spawn rate of critters.
My first house in Terraria was on a sky island and I was covered up in bunnies.
And not too long ago, in a newer world, I made a house in the UG Jungle and moved the Merchant down there. Lo and behold I had a bunny hopping into the Temple.

 

[Elk]

They spawn around NPC homes.

NPC's do increase the spawn rate of critters.

Thats good and all, but look at the last picture. Im pretty sure that was a medium world (if not a large) and I was at lava level. On most my worlds, including that one I just build all my npc houses near my spawn on the surface

 

[zimberzimber]

Thats good and all, but look at the last picture. Im pretty sure that was a medium world (if not a large) and I was at lava level. On most my worlds, including that one I just build all my npc houses near my spawn on the surface

They tend to travel around and they don't take fall damage.
Also they don't despawn.

 

[Suweeka]

iirc they spawn on dirt. I could test but meh I have errands to do.

 

[Tsuki]

Drow Elves are friends of the forest and all the creatures.

 

[Kyouko Tsukino]

The spawn any where where there's dirt and (possibly) a player nearby.

I have them rain from the "sky" down in my hellbase, even far from the NPC spawns. It's fun to sit and watch them take dives into lava...

 

[Dragrath]

iirc they spawn on dirt. I could test but meh I have errands to do.

They also spawn on dungeon bricks(green ones) I found this out when I had the insane idea to build a house in the dungeon
Also bunnies aren't harmed by dungeon spikes blazing wheels as one would expect do however instantly obliterate them...

 

[Kyouko Tsukino]

I think their spawn logic may be...

If (player) = true then (spawn) = everywhere. //lol fake code.

 

[Youfad]

This fails to make sense to me.

 

[Kyouko Tsukino]

They show up wherever they want to show up.

Ain't no one gonna tell the rabbit where to spawn. Ain't no one.