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There is a question here asking if sea sponges are Kosher. The answers seem to center around the idea that regardless of if they have animal cells, a halachic classification might depend on how it appears (and coral, for example, vaguely look like some sort of plant).

As a followup, are plants that exhibit rapid plant movement such as the venus flytrap, which have moving parts to eat insects considered to be animals in that they wouldn't be Kosher due to this characteristic?

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Adnei Hasadeh(kilaiyim 8:5) half plant half person considered a chayah. – sam Jul 26 '13 at 2:28
@sam Is there a way in which adnei hasadeh are considered plants - biologically or otherwise? – WAF Jul 26 '13 at 13:39
up vote 2 down vote accepted

I asked R' Natan Slifkin this question by email, and he responded that no, rapidly-moving plants are not considered animals, as dictated by common sense.

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I'm sure you have a lot of fun emailing people who have their own Wikipedia pages ;) – Shokhet Jul 8 '14 at 3:54
Does this include Triffids? – TRiG Oct 7 '14 at 17:55
What are they instead? – Adám Dec 14 '14 at 15:49
Please source common sense. – Adám Dec 14 '14 at 15:59

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