Interactive Learning & Field Guides
Hands-on cladograms, taxonomic field guides, IUCN Red List conservation biology, and Hubble/JWST galaxy morphology atlases designed for learners of all ages.
Tree of Life Cladogram
18 Clade Trees & SynapomorphiesInspect branching evolutionary trees across 18 major clades—from Eutherian mammals, dinosaurs/birds, and insects to fungi, sponges, and vascular plants—with shared derived traits (synapomorphies).
Biological Field Guide
Specimen Compendium & TaxaDexSearch and filter all 606 scientifically verified species across 18 broad taxonomic groups. View specimen photographs, full Linnaean hierarchies, diagnostic anatomical features, and evolutionary notes.
RedList: Conservation Guide
6-Tier IUCN Threat SpectrumLearn how conservation biologists assess extinction risk across the 6 IUCN Red List tiers—from Least Concern (LC) to Critically Endangered (CR) and Extinct (EX)—across 196 profiled species.
CosmoMorph: Galaxy Guide
Hubble Sequence & Deep Sky AtlasMaster the Hubble–de Vaucouleurs galaxy classification sequence, astronomical plate filters (Negative Luminance & High Contrast), tidal merger physics, and supernova remnants.
🌳 Jump Directly to a Clade Tree
Click any clade to inspect its branching topology and synapomorphies🐾 RedList Guide: The 6-Tier IUCN Conservation Spectrum
The IUCN Red List of Threatened Species evaluates wild populations using quantitative thresholds across five criteria (Criteria A–E): rate of population reduction, geographic range size (Extent of Occurrence & Area of Occupancy), small population size and decline, very small/restricted populations, and quantitative extinction probability analysis.
Widespread, abundant taxa with stable or increasing global wild populations, or formerly imperiled species that have achieved strong recovery under legal protection.
Populations experiencing habitat fragmentation, climate stress, or localized decline (typically 20–29% over 3 generations), or species dependent on ongoing conservation management to prevent entering Vulnerable status.
High risk of extinction in the wild: ≥30–50% population decline over 10 years or 3 generations, Extent of Occurrence <20,000 km2, or fewer than 10,000 mature individuals.
Very high risk of extinction in the wild: ≥50–70% population reduction, Extent of Occurrence <5,000 km2, or fewer than 2,500 mature individuals across fragmented habitats.
Extremely high risk of imminent extinction in the wild: ≥80–90% population collapse, Extent of Occurrence <100 km2, or fewer than 250 mature wild individuals remaining.
Exhaustive surveys across historic and prehistoric ranges confirm that no surviving individuals exist anywhere on Earth (including Pleistocene megafaunal extinctions and historical insular wipeouts).
🧪 The Captive–Wild Paradox
The Axolotl (Ambystoma mexicanum, CR) and Golden Hamster (Mesocricetus auratus, EN) number in the millions in laboratories and homes worldwide, yet IUCN assessments evaluate wild populations only—where the Axolotl is restricted to remnant canals of Lake Xochimilco.
🌍 Invasive Abroad, Imperiled at Home
The European Rabbit (Oryctolagus cuniculus, EN) and Monterey Pine (Pinus radiata, EN) are abundant introduced species across Australia and New Zealand, yet suffer severe declines from viral hemorrhagic disease and pitch canker in their native ranges.
📈 Landmark Conservation Recoveries
International bans on commercial whaling and organochlorine pesticides (DDT) enabled the Humpback Whale (LC), Bald Eagle (LC), and Peregrine Falcon (LC) to rebound from the brink of extinction, while habitat restoration downlisted the Giant Panda from EN to VU.
🦴 Pleistocene & Insular Extinctions
Apex hypercarnivores like the Saber-toothed Cat (Smilodon fatalis, EX) vanished at the Pleistocene–Holocene transition (~10,000 BP) when megafaunal prey collapsed, whereas flightless island endemics like the Dodo (EX, c. 1662) and Great Auk (EX, 1844) succumbed to human overhunting and invasive predators.
🌌 CosmoMorph Guide: Galaxy Morphology & Deep Sky Survey
Inspired by citizen-science sky surveys and the Hubble–de Vaucouleurs Morphological Sequence, CosmoMorph trains observers to classify galaxies and nebulae by inspecting spiral density waves, central stellar bars, triaxial spheroids, collisional rings, gravitational tidal tails, and supernova shock shells.
Flat rotating disk where logarithmic spiral arms wind directly outward from a spherical central bulge without a linear stellar bar. Blue H II knots and dark dust lanes trace active star formation along density waves.
Features a rigid linear bar of stars crossing the nuclear bulge; spiral arms emerge from the ends of the bar. The bar exerts gravitational torque that funnels gas inward to feed nuclear starbursts and central black holes.
Smooth spheroidal galaxies (E0 spherical to E7 elongated) or armless disks (S0) dominated by ancient red/yellow Population II stars, random 3D stellar orbits, and massive central black holes rather than spiral arms.
Detached circular rings of hot OB stars produced by bullseye drop-through collisions (or Lindblad resonances), alongside dwarf irregular galaxies undergoing violent starburst superwinds without coherent spiral symmetry.
Gravitationally colliding galaxies where mutual tidal forces strip out 100,000-light-year stellar tails, bridges, and warped disks while compressing molecular clouds into thousands of super-star clusters.
Intragalactic gas and dust structures within the Milky Way: star-forming H II regions sculpted by UV radiation, bipolar planetary nebulae shed by dying sun-like stars, and relativistic supernova shockwave shells.
🔭 True Color Composite
Combines broadband optical/infrared filters to distinguish stellar populations: blue/violet traces short-lived, massive OB stars in active star-forming arms, while gold/amber traces older K and M giant stars in bulges and ellipticals.
🌑 Negative Plate (Inverted Luminance)
Human vision detects faint dark striations against a bright background far more easily than dim glow against black sky. Astronomers invert plates to trace low-surface-brightness tidal tails, outer rings, and dust lanes.
✨ High-Contrast Stretch
Applies a non-linear dynamic range stretch that suppresses diffuse halo glare to isolate high-surface-brightness nuclear structures—such as straight SB stellar bars, circumnuclear starburst rings, and relativistic AGN jets.
🎯 Astrometry & Redshift Telemetry
Combines angular scale (arcseconds) with spectroscopic redshift distance: an object at 1,300–6,500 light-years lies inside our Milky Way (Nebula/SNR), whereas targets at 12–320 million light-years are extragalactic systems.
Homology vs. Convergence
Look-Alikes & PhyloCladeDistinguish true shared ancestry (homologous traits) from evolutionary look-alikes shaped by convergent ecology.
Practice Look-Alikes →Continental Biogeography
Where in the World?Explore endemic radiations, Gondwanan vicariance, and oceanic island dispersal across 7 continents and 5 oceans.
Explore Biogeography →Biophysics & Protein Folding
FoldLab Lattice SimulatorFold hydrophobic-polar polypeptide chains on a 2D lattice to visualize hydrophobic collapse and disulfide cystine bridges.
Launch FoldLab →Genetic Code & Mutations
Codon RunTranslate mRNA codon by codon into real peptide hormones and classify point mutations as silent, missense or nonsense.
Launch Codon Run →Comparative Anatomy in Art
Field Illustrations & WikiDiscover the biological precision behind CRV Science field illustrations and read in-depth syntheses in the Knowledge Wiki.