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6 votes
Accepted

What snake is this? Is it venomous?

Looks like an eastern copperhead (Agkistrodon contortrix). It is one of 6 venomous snakes in Arkansas (of a total ~39 AR species; see University of Arkansas). See Herps of Arkansas for a nice range ...
theforestecologist's user avatar
5 votes

If the shrimp is a decapod, why does it have 20 legs? (10 swimming + 10 walking legs)

Species are classified based on common ancestry. See https://en.m.wikipedia.org/wiki/Cladistics Decapods aren't classified together because of the number of legs they have. That's where the order got ...
Bryan Krause's user avatar
  • 45.9k
4 votes

Butterfly wings with ragged edges - worn out, camouflage, fungus, or something else?

In both these cases, the butterflies are old (relatively speaking) and worn. Usually, adult butterlies only live during a specific season (which usually can last weeks to months) or with several ...
fileunderwater's user avatar
1 vote
Accepted

What is the term for a missing feature in a descendant that was present in an ancestor which defines a clade?

Maybe you're thinking of a vestigial trait? In snakes, legs are considered "vestigial"; some snakes retain remnants of legs and pelvis (https://www.amnh.org/exhibitions/darwin/evolution-...
Lynnkz's user avatar
  • 81
1 vote

Have any animal been discovered which don't have any kind of symmetry?

Sponges. Everything else is either radially or bilaterally symmetric.
Sir Thinksalot's user avatar

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