Manticore at D3, Wyvern at D4

[Sandman25]

I have just found Manticore Skeleton at D3 and Wyvern Skeleton at D4 (playing trunk). Is it normal? Wyvern Skeleton is fast, I am not sure how normal speed character can deal with it if stairs are not nearby. Also found 2 Blink Frogs (at D3 and D4). http://crawl.chaosforge.org/Giant_frog lists them as

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commonly found as out-of-depth creatures on D:3 or 4

but I am sure I have not triggered OOD monsters yet (floor 4, 4300 turns).

[cerebovssquire]

Well, you haven't activated the turn-based OoD trigger yet, but OoD monsters can still spawn regardless (though you won't get crazy things like D:1 fire giants this way). It's a normal thing.
I assume you don't mean blink frogs, but giant frogs - you say two different things. Because blink frogs would be pretty crazy, and I don't think D:3 blink frog would be a possible "normal" OoD spawn (as in, without waiting). BTW D:3 and D:4 isn't OoD for giant frogs, lol crawlwiki

[Sandman25]

Well, you haven't activated the turn-based OoD trigger yet, but OoD monsters can still spawn regardless (though you won't get crazy things like D:1 fire giants this way). It's a normal thing.
I assume you don't mean blink frogs, but giant frogs - you say two different things. Because blink frogs would be pretty crazy, and I don't think D:3 blink frog would be a possible "normal" OoD spawn (as in, without waiting). BTW D:3 and D:4 isn't OoD for giant frogs, lol crawlwiki

Thank you. Yes, I confused Giant Frog with Blink Frog Still they were displayed in game as "extremely dangerous" to my character.

[jejorda2]

Giant Frogs on D3 is pretty normal, but mon-pick has been changed. I think zombies change more than others, so those oddly early zombies might be the result of that.

From the change log:

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34b3b44 | Adam Borowski | 2013-03-21 05:45:35 +0100

Merge branch 'mon-pick'
The behaviour should be preserved exactly or almost exactly, only the code
changes from totally, utterly unreadable to merely hard to read.

Actual differences:
* strong OODs in shallow branches would degenerate into picking a monster
  randomly from the whole branch, now they pick from the bottom level (or
  so-called OOD cap of Elf:7, Tomb:5, D:31 and Vaults:15).
* Zot no longer replaces requests for Zot:5 by Zot:4, and proper hells,
  $(HELL):4-7 by $(HELL):3.
  * this means hell monster sets need fixing!
* zombie size doesn't affect their spawning
* zombie selection obeys the depth passed
  * which makes zombie sets pretty limited -- needs review/redesign?

The new format is:
{  9, 19,  826, SEMI, MONS_YAK },
which means: yaks can spawn on D:9-19, with _linear_ rarity 826 in the
middle of the range.  A "SEMI" distribution means that at the edges,
D:9 and D:19, the effective rarity is half that, 413.

Distributions:
FLAT   100% 100% 100%
SEMI    50% 100%  50%
PEAK     0% 100%   0%
UP       0%  50% 100%
DOWN   100%  50%   0%

 
That "0%" doesn't mean the monster won't spawn on the top/bottom level
(D:9 and D:19 for yaks), the range is fudged so D:8 receives 0% chance,
D:9 16.6%, linearly up to 100% on D:14.

Yes, this sounds and is complex, but at least the complexity is not strewn
around obscure code anymore, and a number of limitations have been lifted.

ZotDef still uses the old code via an emulation layer.