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For species that inhabit architecture (e.g., burrows, nests, or other structures), certain parts of the body are more exposed than others, potentially serving as superior platforms for signaling via coloration. Yet whether animals differentially advertise red coloration on body parts that are more versus less exposed from their architecture remains to be tested. Here, we systematically quantified red coloration in social hermit crabs (Coenobita compressus). These crabs inhabit architecturally remodeled shells and have claws that visibly block the shell entrance, like doors to their homes. We hypothesized that red coloration of claws may be a signal of resource-holding potential (RHP). Consistent with this RHP signaling hypothesis, we found that within the same individuals\u2019 bodies, exposed claws showed significantly greater red coloration than unexposed carapaces. Furthermore, larger body size predicted greater red coloration of claws. Competing hypotheses (e.g., interspecific signaling, camouflage, and UV protection), while not explicitly tested, nevertheless appear unlikely based on natural history. Red claw coloration may therefore function as a signal to conspecifics, and experiments are now needed to test recipient responses. Broadly, relative to surrounding architecture, exposed body surfaces offer rich potential as signaling platforms for coloration.<\/jats:p>","DOI":"10.1093\/iob\/obad018","type":"journal-article","created":{"date-parts":[[2023,5,23]],"date-time":"2023-05-23T11:06:14Z","timestamp":1684839974000},"source":"Crossref","is-referenced-by-count":1,"title":["Doors to the Homes: Signal Potential of Red Coloration of Claws in Social Hermit Crabs"],"prefix":"10.1093","volume":"5","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7331-2414","authenticated-orcid":false,"given":"C T M","family":"Doherty","sequence":"first","affiliation":[{"name":"Department of Biological Sciences, Graduate Program in Ecology, Evolution, Environment, and Society, Dartmouth College , Hanover, NH 03755 , USA"},{"name":"School of Health Sciences, Ulster University , Belfast BT15 1ED , UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4024-6972","authenticated-orcid":false,"given":"M E","family":"Laidre","sequence":"additional","affiliation":[{"name":"Department of Biological Sciences, Graduate Program in Ecology, Evolution, Environment, and Society, Dartmouth College , Hanover, NH 03755 , USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"286","published-online":{"date-parts":[[2023,5,22]]},"reference":[{"key":"2023061318222531900_bib1","doi-asserted-by":"crossref","first-page":"239","DOI":"10.1007\/BF00345169","article-title":"Shell selection and utilization in a terrestrial hermit crab, Coenobita compressus (H. 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