Huh, wild. I listen to British TV all the time and never made that distinction, but that is definitely how they say it.
so far the only kanji I got the trouble to memorize the second reading was 象,
all the time it was ぞう、but then words with しょう started appearing and I always freeze for a second before answering it when it appears 
Also, 90% of the time by this lvl 29 I am now, I see that words usually are jukugo, they are both onyomi. Only a few exceptions they are both kunyomi.
it is frustrating but it only happens sometimes.
Other way around.
On’yomi is the “foreign” Chinese-origin reading, hence the “foreign word” katakana.
I had to go back and check but they actually explained this one: when it’s read ぞう it means elephant and when it’s read しょう it means phenomenon. So when you see it in a compound that doesn’t have anything to do with elephants it’s read しょう.
Pretty much this. I’ve not seen it being read ぞう outside of the “elephant” vocab item. I’m kind of glad animal names also use katakana to avoid confusion like this . I have ゾウ in my Anki deck, for instance. Perhaps to avoid confusion entirely, WaniKani could’ve avoided using “elephant” as the main meaning for the kanji.
I was curious about the whole elephant deal and it indeed is ぞう when the word is somehow related to elephants, like an elephant trunk, ivory, etc. The only word that has nothing to do with elephants I found is 象嵌 (inlaying metals).
Anything unrelated to elephants is irrelephant.
…this is why i’m hopeless.
i guess reading that, combined with seeing the kanji used for kun/on should make it easier to remember now.
you are forgeting about image 画像
Hahaha, 大失敗 on my part. I even have it in my Anki decks 
Different kanji. 像, also read as ぞう (just to be annoying), means “statue”.
(Compare 象 = elephant.)
But yeah, I almost made that mistake in my earlier reply before I spotted the difference. 
What if you have an elephant phenomenon, would it be ぞうぞう or ぞうしょう?
It would be an elephenomenon
As long as it just buzzes everytime I write the wrong reading, instead of marking the review as wrong, fine by me.
I found it to be a bit confusing at first, though…
Also, some kanji, like 込 and 匂 don’t have onyomi because they’re 国字
It isn’t a rule either as they can just ‘invent’ a onyomi like 働, but I guess the composition would suggest the onyomi.
It gets funny enough with 想像 as in 想像に任せる (to leave to someone’s imagination)
The way I look at combinations like these is that these are in fact 2 words and not one, as in it’s the “east entrance/exit” or the “east side”. There is a couple combinations with kun + on or on + kun where it’s also pretty clear that these are just 2 words mashed together (公開日, 係員, 西日本, etc.)
I felt that way. Every time WK gave me a new kanji, i’d have to look up the readings and sort them out. I’d use the notes section that you can edit on each kanji’s review page. That’s good you actually care about knowing what you’re learning.
I agree with you, it’d be nice and more beneficial for new learners to get the difference down from the start. My guess why WK is the way it is regarding this (and other things too), is that learning Japanese is hard and it’s not good for business to scare current customers away by dropping too much on them too soon.
I’m not saying it’s bad, necessarily. It’s definitely not the best way to do for the serous learner, but it’s fine for people who want to Japanese as a hobby or strictly for fun. We all put our energy/focus into different things.
I elephind this pun reasonably funny.