Thanks. Can they climb "hurting" blocks? I think about cactus. But maybe is there some other blocks that could cause them damages while climbing?
From the behavior in-game, it appears spiders can climb cactus but don't. They seem to avoid cactus where possible and "drop off" when receiving damage.
Berry bushes and wither rose interaction appears to be similar to cactus from various descriptions, but not tested as 1.14 is still in official snapshots.
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WARNING: I have an extemely "grindy" playstyle; YMMV — if this doesn't seem fun to you, mine what you can from it & bin the rest.
Something like this is just how I pre-kill spiders before the drop in my exp mob farm. 'O' = the drop shaft, v = water (lower level)
It's too much of a hassle dropping spiders into the same kill box you're using to whack at the legs of creepers, skeletons, and so on. If the kill box far below is 2-deep and 2-wide, then it's easy for creepers to catch a glimpse of you ... and hard for you to hit their legs.
The Meaning of Life, the Universe, and Everything.
Yes, TheWesson! But since I play with my young boy, and he's sometimes a little bit anxious when hearing mobs sounds nearby. So, I prefer letting the mobs dying cleanly and quickly from a fall
I just had issue with spiders that refused to fall, but the cactus did the trick (see here for a screencap). Not as cleanly and silently I could have wished, but they don't spawn that frequenlty. So that should be OK.