This species is schooling and highly social, often forming large aggregations in rivers and streams. The Genus #𝑅𝑎𝑠𝑏𝑜𝑟𝑎 includes many species popular in aquaria, but 𝑅. 𝑟𝑎𝑠𝑏𝑜𝑟𝑎 remains a cornerstone for understanding cyprinid #evolution. #TautonymTuesday #Systematics Photo: Mark Duffill

#𝑅𝑎𝑠𝑏𝑜𝑟𝑎 𝑟𝑎𝑠𝑏𝑜𝑟𝑎 has a streamlined body, silvery scales, and a forked tail adapted for fast swimming in flowing waters. It feeds on small #invertebrates and algae, playing a key role in nutrient cycling in tropical freshwater habitats. #TautonymTuesday #Systematics Photo: Mark Duffill

And it’s another SUPER #TAUTONYM: The nominate subspecies 𝑅𝑢𝑝𝑖𝑐𝑎𝑝𝑟𝑎 𝑟𝑢𝑝𝑖𝑐𝑎𝑝𝑟𝑎 𝑟𝑢𝑝𝑖𝑐𝑎𝑝𝑟𝑎 (Alpine #chamois) ranges across #Austria, France, Germany, Italy, Switzerland, Slovenia, and Slovakia. Adapted to alpine habitats, it’s a master of vertical terrain! #TautonymTuesday #Systematics Photo: Isiwal

#Chamois have short, hooked #horns, a stocky build, and seasonal coat changes—thicker and darker in winter, lighter in summer. Their specialized hooves provide traction on rocky surfaces, making them exceptional climbers. #TautonymTuesday #Systematics Photo: Andreas Tille

#Angelsharks represent an ancient lineage, diverging early from other #sharks. Once widespread, they are now critically #endangered due to bycatch and habitat loss, making #conservation efforts vital. #TautonymTuesday #Systematics Photo: Julien Renoult

𝑆𝑞𝑢𝑎𝑡𝑖𝑛𝑎 𝑠𝑞𝑢𝑎𝑡𝑖𝑛𝑎 has a broad, flattened body, large pectoral fins, and camouflaged skin for ambush #predation. Unlike #rays, it retains shark-like features such as dorsal fins and a terminal mouth. It preys on #fish and invertebrates. #TautonymTuesday #Systematics #sharks Photo: Ben Jobson

Powerfully pungent and provocative post!

Bearded sakis live in cohesive groups and are highly arboreal, moving rapidly through the canopy. They exhibit complex social behaviors, including vocal communication and cooperative vigilance against predators. #TautonymTuesday #Systematics #Primates #Mammals Photo: Fábio Manfredini

𝐶ℎ𝑖𝑟𝑜𝑝𝑜𝑡𝑒𝑠 𝑐ℎ𝑖𝑟𝑜𝑝𝑜𝑡𝑒𝑠 has a robust body, long bushy tail, and distinctive beard. Its specialized dentition and jaw strength allow it to exploit seeds and nuts, making it an important seed disperser in tropical ecosystems. #TautonymTuesday #Systematics #Primates #Mammals Photo: Craig Sladden

Reminder that The Gateway Arch in St. Louis was built on Mill Creek Valley, a Black neighborhood. To clear land for construction, more than 20,000 residents, 95% of whom were Black, were displaced. Further, nearly 300 Black businesses were destroyed.

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And it's another 𝐒𝐔𝐏𝐄𝐑 𝐓𝐀𝐔𝐓𝐎𝐍𝐘𝐌: The nominate subspecies 𝑅𝑒𝑔𝑢𝑙𝑢𝑠 𝑟𝑒𝑔𝑢𝑙𝑢𝑠 𝑟𝑒𝑔𝑢𝑙𝑢𝑠 ranges across Pakistan, India, Nepal, and Bangladesh. Adapted to montane forests, it’s known for its cold tolerance and energetic foraging. #TautonymTuesday #Systematics Photo: Francis C. Franklin

𝑅𝑒𝑔𝑢𝑙𝑢𝑠 𝑟𝑒𝑔𝑢𝑙𝑢𝑠 has a short, rounded body, needle-like bill, and a striking yellow-orange crest bordered by black. It flits through conifers, feeding on insects and spiders, and plays a key role in forest food webs. #TautonymTuesday #Systematics Photo: Eugene Stolyarov