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Mysticete whales are a group of gigantic, marine filter\u2010feeders that are defined by their fringed baleen and are divided into two groups: balaenids and rorquals. Recent studies have shown that balaenids likely feed using a self\u2010cleaning, cross\u2010flow filtration mechanism where food particles are collected and then swept to the esophagus for swallowing. However, it is unclear how filtering is achieved in the rorquals (Balaenopteridae). Lunging rorqual whales engulf enormous masses of both prey and water; the prey is then separated from the water through baleen plates lining the length of their upper jaw and positioned perpendicular to flow. Rorqual baleen is composed of both major (larger) and minor (smaller) keratin plates containing embedded fringe that extends into the whale's mouth, forming a filtering fringe. We used a multimodal approach, including microcomputed tomography (\u00b5CT) and scanning electron microscopy (SEM), to visualize and describe the variability in baleen anatomy across five species of rorqual whales, spanning two orders of magnitude in body length. For most morphological measurements, larger whales exhibited hypoallometry relative to body length. \u00b5CT and SEM revealed that the major and minor plates break away from the mineralized fringes at variable distances from the gums. We proposed a model for estimating the effective pore size to determine whether flow scales with body length or prey size across species. We found that pore size is likely not a proxy for prey size but instead, may reflect changes in resistance through the filter that affect fluid flow.<\/jats:p>","DOI":"10.1002\/jmor.21574","type":"journal-article","created":{"date-parts":[[2023,2,21]],"date-time":"2023-02-21T12:18:17Z","timestamp":1676981897000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Formation of a fringe: A look inside baleen morphology using a multimodal visual approach"],"prefix":"10.1002","volume":"284","author":[{"given":"Megan L.","family":"Vandenberg","sequence":"first","affiliation":[{"name":"Department of Biology University of Washington Seattle Washington USA"},{"name":"Friday Harbor Laboratories University of Washington Friday Harbor Washington USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6556-5414","authenticated-orcid":false,"given":"Karly E.","family":"Cohen","sequence":"additional","affiliation":[{"name":"Department of Biology University of Washington Seattle Washington USA"},{"name":"Friday Harbor Laboratories University of Washington Friday Harbor Washington USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Robert D.","family":"Rubin","sequence":"additional","affiliation":[{"name":"Santa Rosa College Santa Rosa California USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4170-7294","authenticated-orcid":false,"given":"Jeremy A.","family":"Goldbogen","sequence":"additional","affiliation":[{"name":"Hopkins Marine Station Stanford University Pacific Grove California USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1930-9748","authenticated-orcid":false,"given":"Adam P.","family":"Summers","sequence":"additional","affiliation":[{"name":"Department of Biology University of Washington Seattle Washington USA"},{"name":"Friday Harbor Laboratories University of Washington Friday Harbor Washington USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9317-4621","authenticated-orcid":false,"given":"E. 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