Grumpy Old Geeks Topics Hermit crab shell exchange Topic Hermit crab shell exchange 2 mentions in 1 episode The speakers discuss hermit crabs lining up by size and exchanging shells. Mentions 688: Why, Combinator? Mar 14, 2025 1:19:18 they will arrange themselves in order of size based on their shells in a conga line 1:20:09 it's David Attenborough