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Let's talk about this topic.
well, I mean, there's a great explanation's for this, it's on r/jaguarland.
the post is "Jaguar weights and Measurements compilation:A review."
It's really worth it, I recomend you see it, it's really worth it.
but I will say one thing.
They didn't estimate Joker to be 159 kg, he was 155 kg.
Furthermore, yes, probably 128 cm of chest would be the normal size for a jaguar over 140 kg.
But one thing is a jaguar with a chest measuring 128 cm, but with all other measurements being average.
Another thing is Joker who, in addition to his 128 cm chest, also has a 1.80 m body, which is exceptional for a Jaguar, a neck circumference compared to that of a leopard and several other things, which makes him over 150 kg.