{"id":10018,"date":"2025-12-18T00:07:55","date_gmt":"2025-12-18T00:07:55","guid":{"rendered":"https:\/\/readtrends.com\/en\/ancient-bee-nests-fossils\/"},"modified":"2025-12-18T00:07:55","modified_gmt":"2025-12-18T00:07:55","slug":"ancient-bee-nests-fossils","status":"publish","type":"post","link":"https:\/\/readtrends.com\/en\/ancient-bee-nests-fossils\/","title":{"rendered":"Discovery of ancient bee nests in fossils points to a never-before-seen behavior"},"content":{"rendered":"<article>\n<h2>Lead<\/h2>\n<p>Researchers have identified tiny mud nests built by bees inside fossilized skulls and jaw bones recovered from a limestone cave on Hispaniola, a discovery published 17 December 2025 in Royal Society Open Science. The finds, dated to roughly 20,000 years ago, represent the first recorded use of bones as nesting substrate by bees and expand the known range of bee nesting behaviours in the Caribbean. Field and museum scientists say the nests were constructed within empty tooth sockets and other cavities preserved in a multi\u2011species fossil deposit. The result suggests complex, repeated nesting activity \u2014 likely over multiple generations \u2014 in a protected cave environment.<\/p>\n<h2>Key Takeaways<\/h2>\n<ul>\n<li>Researchers reported the nests in a study published 17 December 2025 in Royal Society Open Science; the material comes from a limestone cave on Hispaniola and was examined using CT scans and 3D X\u2011ray imaging.<\/li>\n<li>The bone nests are estimated to be about 20,000 years old, filling a temporal gap between older Caribbean bee fossils found in amber (circa 20 million years) and modern records.<\/li>\n<li>Up to six successive generations of brood cells were identified within a single tooth socket, suggesting repeated reuse of the same cavities.<\/li>\n<li>The nests\u2019 internal texture and composition\u2014compact mud lined with a waxy coating\u2014match soil\u2011nesting bee construction rather than wasp paper nests.<\/li>\n<li>No bee body fossils were preserved in the cave deposits; the named trace fossil, Osnidum almontei, identifies the nesting structure, not a preserved species body.<\/li>\n<li>Investigators hypothesize barn-owl accumulation and an 8\u2011meter sink into the cave as factors in the mass fossil deposit that preserved the nesting traces.<\/li>\n<li>The discovery suggests that some bees used shaded, humid cave soils and bone cavities as secure nesting sites, a behaviour not previously documented in the Caribbean fossil record.<\/li>\n<\/ul>\n<h2>Background<\/h2>\n<p>Most people picture bees as social, tree\u2011hanging hive builders, but about 90% of bee species are solitary and nest in soils, rotten wood or plant stems. Fossil evidence for these solitary behaviors is sparse in island contexts because body fossils are rare and amber records represent much older time slices. The Hispaniola cave contains layered deposits from more than 50 vertebrate species, accumulated over generations by predators such as barn owls and by animals falling into the cave\u2019s steep entrance.<\/p>\n<p>Bone preservation in the cave\u2014protected from storms and flood events\u2014created an unusual archive. Over time some bone cavities became filled with sediment that later hardened and fossilized, offering an opportunity for small organisms to leave trace fossils. Trace fossils (ichnofossils) like brood cells, tunnels and borings record behaviour rather than anatomy and can reveal activities that body fossils alone do not capture. Until now, Caribbean bee trace fossils had not been reported from cave deposits.<\/p>\n<h2>Main Event<\/h2>\n<p>The discovery began during a 2022 field survey when researchers from the Field Museum and collaborators retrieved fossil bones for study. In the lab, a team led by postdoctoral researcher L\u00e1zaro Vi\u00f1ola\u2011L\u00f3pez noticed unusual, soil\u2011filled cavities within jaws and tooth sockets. High\u2011resolution CT scanning revealed discrete, mud\u2011lined cells consistent with bee brood chambers rather than animal burrows or detritus.<\/p>\n<p>Comparative analysis of internal morphology showed smooth, compacted walls coated with a waxy lining\u2014characteristic of ground\u2011nesting bees that seal cells for larvae. The architecture differed from wasp mud nests, which incorporate chewed plant fibers and saliva and present a fibrous internal texture. Multiple stacked cells within single sockets indicated repeated reuse over time.<\/p>\n<p>Age estimates based on the cave stratigraphy and associated vertebrate fossils place the nests at about 20,000 years old. Because the cave did not preserve insect bodies, the authors could not assign the nests to a living species; instead they described the trace fossil as Osnidum almontei, honoring the scientist who first reported the cave. The team notes that the behaviour could represent either an extinct lineage or an undocumented nesting habit in extant bees.<\/p>\n<h2>Analysis &#038; Implications<\/h2>\n<p>The bone\u2011nesting record expands the behavioural repertoire known for bees and highlights the role of trace fossils in reconstructing paleoecology. If ground\u2011nesting bees repeatedly used bone cavities in a cave, it implies local ecological conditions\u2014stable humidity, shelter from rain and predators\u2014that made such sites advantageous. These microhabitats would have buffered brood from temperature and moisture extremes while concentrating resources for nesting across generations.<\/p>\n<p>On an island biogeography level, the find underscores how limited sampling and preservation bias can obscure behavioural diversity. Amber captures older lineages and preserves body parts; cave and sedimentary contexts may better record ephemeral behaviours such as nesting site choice. For conservation and evolutionary studies, recognizing such behaviours in the past helps frame how insular pollinator communities adapted to fluctuating environments.<\/p>\n<p>Practically, the discovery affects how curators and paleontologists inspect museum specimens. The authors stress that bones and other substrates can retain small\u2011scale structures that illuminate interactions between invertebrates and vertebrate remains. Future surveys that combine micro\u2011CT scanning and targeted sampling of cave sediments could reveal similar traces on other islands or mainland sites.<\/p>\n<h2>Comparison &#038; Data<\/h2>\n<figure>\n<table>\n<thead>\n<tr>\n<th>Record type<\/th>\n<th>Approx. age<\/th>\n<th>Preservation<\/th>\n<th>Typical context<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Bone brood cells (this study)<\/td>\n<td>~20,000 years<\/td>\n<td>Mineralized sediment in tooth sockets<\/td>\n<td>Limestone cave deposits, protected microclimate<\/td>\n<\/tr>\n<tr>\n<td>Caribbean bee body fossils (amber)<\/td>\n<td>~20 million years<\/td>\n<td>Insect bodies in amber<\/td>\n<td>Forest resin deposits<\/td>\n<\/tr>\n<tr>\n<td>Modern ground\u2011nesting bees<\/td>\n<td>Present<\/td>\n<td>Soil burrows, plant stems<\/td>\n<td>Open ground, shaded soils<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<p>The table places the new bone\u2011nest record between older amber fossils and modern observations, illustrating how different preservational pathways capture different aspects of bee history. The cave context yields behavioural evidence absent from amber, while amber provides anatomical detail that the cave deposit lacks. Together these datasets offer a more complete picture of past pollinator diversity.<\/p>\n<h2>Reactions &#038; Quotes<\/h2>\n<blockquote>\n<p>\u201cIt was very surprising to find invertebrate nesting traces in that cave,\u201d<\/p>\n<p><cite>L\u00e1zaro Vi\u00f1ola\u2011L\u00f3pez (Field Museum postdoctoral researcher, lead author)<\/cite><\/p><\/blockquote>\n<p>Vi\u00f1ola\u2011L\u00f3pez emphasized the unexpected nature of the find and the value of close inspection of fossil material. He noted that what looked like simple sediment fills turned out to be structured brood cells once scanned.<\/p>\n<blockquote>\n<p>\u201cThis adds to the record of \u2018hidden biodiversity,\u2019\u201d<\/p>\n<p><cite>Stephen Hasiotis (University of Kansas, geology and ichnology expert, commentary)<\/cite><\/p><\/blockquote>\n<p>Hasiotis, not involved in the study, pointed out that trace fossils can reveal ecological roles and behaviours that body fossils miss, and that cave microclimates likely promoted repeated nesting.<\/p>\n<blockquote>\n<p>\u201cInsects have been adapting for hundreds of millions of years; this is another reminder of their behavioural flexibility,\u201d<\/p>\n<p><cite>Anthony Martin (Emory University, environmental sciences)<\/cite><\/p><\/blockquote>\n<p>Martin highlighted the evolutionary perspective: ground\u2011nesting lineages have long demonstrated adaptability, and unexpected nesting sites provide new data points for understanding that history.<\/p>\n<aside>\n<details>\n<summary>Explainer: What are ichnofossils and why do they matter?<\/summary>\n<p>Ichnofossils are traces left by organisms\u2014such as footprints, burrows, feeding marks or brood cells\u2014rather than preserved body parts. They record behaviour (where an animal moved, fed or nested) and can survive where body fossils do not. In the case of brood cells, internal structure, layering and wall linings can be diagnostic of taxonomic groups and nesting strategies. Ichnofossils therefore complement body fossils to reconstruct past ecosystems and species interactions.<\/p>\n<\/details>\n<\/aside>\n<h2>Unconfirmed<\/h2>\n<ul>\n<li>Which exact bee species made the nests remains unknown because no insect bodies were preserved in the cave deposits.<\/li>\n<li>Whether bone\u2011nesting and cave\u2011nesting behaviours persist among modern island bee populations on Hispaniola or nearby islands has not been established.<\/li>\n<li>The precise climatic or ecological triggers that led bees to select bone cavities over more typical substrates remain inferred rather than directly demonstrated.<\/li>\n<\/ul>\n<h2>Bottom Line<\/h2>\n<p>The discovery of mud\u2011lined bee brood cells within fossilized bone cavities on Hispaniola broadens our understanding of bee behavioural diversity and the types of evidence that preserve in the fossil record. The trace fossil Osnidum almontei documents repeated, multi\u2011generational nesting in protected cave microhabitats about 20,000 years ago, a behaviour not previously recorded in Caribbean cave deposits.<\/p>\n<p>Beyond the specific find, this study is a methodological reminder: careful micro\u2011examination of existing museum specimens and targeted imaging techniques can reveal unexpected interactions between organisms. Follow\u2011up field surveys and targeted sampling on Hispaniola and neighboring islands could determine whether similar nesting strategies existed elsewhere or persist today.<\/p>\n<h2>Sources<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.cnn.com\/2025\/12\/17\/science\/ancient-bee-nests-fossils-cave\" target=\"_blank\" rel=\"noopener\">CNN<\/a> (news report summarizing the study and interviews with researchers)<\/li>\n<li><a href=\"https:\/\/royalsocietypublishing.org\/journal\/rsos\" target=\"_blank\" rel=\"noopener\">Royal Society Open Science<\/a> (peer\u2011reviewed journal; study published 17 December 2025)<\/li>\n<li><a href=\"https:\/\/www.fieldmuseum.org\" target=\"_blank\" rel=\"noopener\">Field Museum of Natural History<\/a> (museum; affiliated researchers and specimen curation)<\/li>\n<li><a href=\"https:\/\/www.floridamuseum.ufl.edu\" target=\"_blank\" rel=\"noopener\">Florida Museum of Natural History<\/a> (museum\/press releases related to Caribbean fossil research)<\/li>\n<\/ul>\n<\/article>\n","protected":false},"excerpt":{"rendered":"<p>Lead Researchers have identified tiny mud nests built by bees inside fossilized skulls and jaw bones recovered from a limestone cave on Hispaniola, a discovery published 17 December 2025 in Royal Society Open Science. The finds, dated to roughly 20,000 years ago, represent the first recorded use of bones as nesting substrate by bees and &#8230; <a title=\"Discovery of ancient bee nests in fossils points to a never-before-seen behavior\" class=\"read-more\" href=\"https:\/\/readtrends.com\/en\/ancient-bee-nests-fossils\/\" aria-label=\"Read more about Discovery of ancient bee nests in fossils points to a never-before-seen behavior\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":10011,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"rank_math_title":"Ancient bee nests in fossils reveal new behavior | Insight Science","rank_math_description":"Tiny mud brood cells found inside fossilized bone cavities in a Hispaniola cave (dated ~20,000 years) reveal bone\u2011nesting bees and expand known pollinator behaviors.","rank_math_focus_keyword":"ancient bees, bee nesting, fossils, Hispaniola, cave nesting","footnotes":""},"categories":[2],"tags":[],"class_list":["post-10018","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-top-stories"],"_links":{"self":[{"href":"https:\/\/readtrends.com\/en\/wp-json\/wp\/v2\/posts\/10018","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/readtrends.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/readtrends.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/readtrends.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/readtrends.com\/en\/wp-json\/wp\/v2\/comments?post=10018"}],"version-history":[{"count":0,"href":"https:\/\/readtrends.com\/en\/wp-json\/wp\/v2\/posts\/10018\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/readtrends.com\/en\/wp-json\/wp\/v2\/media\/10011"}],"wp:attachment":[{"href":"https:\/\/readtrends.com\/en\/wp-json\/wp\/v2\/media?parent=10018"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/readtrends.com\/en\/wp-json\/wp\/v2\/categories?post=10018"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/readtrends.com\/en\/wp-json\/wp\/v2\/tags?post=10018"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}