Domain: Natural Science — Morphology
Target concept: Sexual dimorphism in the European green lizard: Males are bright green with blue spots, females are pale green with brown stripes.

Video generation prompt: A male European green lizard specimen (right) and a female European green lizard specimen (left) are displayed side by side. Both specimens are labeled with their respective sexes, and the image highlights the morphological differences between them.

Evaluation guide:
Target concept: Sexual dimorphism as a visually diagnosable morphological trait in Lacerta viridis, characterized by distinct, generally reliable color-pattern differences between sexes (male: bright green + blue spots; female: pale green + brown dorsal stripes). Minimum mechanistic assumption: These traits have a genetic and hormonal basis and serve adaptive functions in mate recognition and sexual selection; male coloration (particularly blue-spot vividness) is documented to intensify somewhat during the breeding season under hormonal influence, and some sub-adult or intermediate individuals show less distinct patterning, but the depicted adult male vs. adult female contrast remains the generally reliable, textbook pattern rather than an absolute, unvarying rule. Expected phased storyline: (1) Frame opens on neutral background with two lizards side-by-side; (2) Viewer's gaze is guided left→right by spatial labeling ('FEMALE'/'MALE'); (3) Visual attention locks onto diagnostic features: brown stripes (left) → blue spots (right); (4) Contrast confirms the two patterns are visually distinct in this pair of specimens; (5) Final frame holds both labeled specimens in full view under uniform light, enabling direct feature-by-feature comparison. Visibility constraints: Frontal, macro, static, diffused-light view required; no motion, rotation, or occlusion; labels must be legible without zoom; color hex values must fall within biologically validated ranges to prevent perceptual ambiguity.

Manual:
I. Basic Demonstration Information
Demonstration Title: Sexual Dimorphism in the European Green Lizard (Male Bright Green + Blue Spots vs. Female Pale Green + Brown Stripes) Demonstration
Subject: Natural Science - Morphology - Sexual Dimorphism
Demonstration Purpose: By displaying a male (right) and female (left) European green lizard specimen side-by-side with clear sex labels, this demonstration visually isolates and compares their diagnostic morphological features — specifically base color intensity and presence/absence of blue spots (male) versus brown stripes (female); it trains visual feature recognition for reliable sex identification based on characteristic phenotypic traits.

II. Demonstration Carrier/Equipment
Core Carrier: Two preserved, high-fidelity European green lizard (Lacerta viridis) specimens — one verified adult male, one verified adult female — mounted on neutral gray matte background board.
Auxiliary Equipment: Standard museum-grade specimen display case (clear acrylic, anti-reflective coating), calibrated daylight-spectrum LED lamp (5500K, CRI >95), printed waterproof labels: 'FEMALE' (left specimen), 'MALE' (right specimen), positioned centered below each lizard without overlap.

III. Demonstration Content Description
Layout: Place specimens horizontally aligned at eye level, 15 cm apart, centered in frame. Female on left, male on right. Background must be uniform matte gray (L* = 70, a* = 0, b* = 0) to eliminate chromatic contamination.
State Control: Specimens must be dry, non-faded, non-yellowed, with intact scales and pigment retention. No gloss, dust, or damage affecting color or pattern visibility.
Comparison Baseline: Select specimens of matched snout-vent length (±2 mm) to exclude size-based distraction; focus exclusively on color and pattern.

IV. Observation of Core Phenomena
Female Morphology: Left specimen displays uniform pale green base color (hex #C1D9B3) with two parallel, uninterrupted brown dorsal stripes (hex #5C4033), extending from nape to tail base; no blue pigmentation anywhere.
Male Morphology: Right specimen displays saturated bright green base color (hex #6CB33F) with numerous distinct, round-to-oval cobalt-blue spots (hex #2A52BE) concentrated on flanks and lateral neck; zero brown striping.
Characteristic Stability: Pigment patterns are fixed, non-gradient, non-directional, and invariant under consistent lighting — confirming morphological (not optical/artifactual) origin.
Auxiliary Verification: Labels are legible, correctly assigned, and spatially anchored — enabling immediate left=female / right=male mapping without inference.

V. Summary of Key Knowledge Points and Principles
Core Concept: Sexual dimorphism in Lacerta viridis is a genetically determined morphological adaptation expressed in integumentary color and pattern — serving roles in mate recognition, sexual selection, and ecological niche partitioning.
Diagnostic Rule: In typical adult specimens, presence of *blue spots* is a strong, generally reliable indicator of male sex, and presence of *longitudinal brown dorsal stripes* is a strong, generally reliable indicator of female sex; these traits are usually mutually exclusive in clearly mature individuals, but this is not an absolute, 100%-certain rule — some sub-adult males and individual lizards show intermediate or overlapping patterning.
Principle of Visual Feature Recognition: Effective identification requires isolating *characteristic features* (spot geometry, stripe continuity, base hue saturation) while suppressing variable noise (specimen angle, minor wear, lighting intensity).

VI. Demonstration Precautions
Specimen Authenticity: Must be Lacerta viridis — exclude look-alikes (e.g., L. bilineata lacks blue spots; L. trilineata has different stripe count). Use only adult specimens (≥8 cm SVL) to avoid juvenile color ambiguity.
Color Fidelity: Lighting must be D55-standardized; avoid UV or tungsten sources that shift blue/green perception. Monitor screen gamma (2.2) if digitized.
Label Integrity: Physical labels only — no digital overlays. Font: Helvetica Bold, 14 pt, black on white rectangle, bottom-aligned 5 mm below specimen abdomen.
Observation Time: Video duration ≤10 s — sufficient to fixate left→right→label→feature comparison sequence.

Prompt Grounding rubric:
level_1: No two lizard specimens are shown side by side; there are no sex labels; the animals shown are not recognizable as green lizards at all (e.g., a different species, an abstract image, text only, or a single unlabeled animal).
level_2: Two lizard-like figures appear, but they are not labeled by sex, or the labels are swapped (e.g., 'male' on the left and 'female' on the right); or the coloration is completely wrong for the concept (e.g., both animals are blue, both are brown, or the image is grayscale); the basic left/right sex assignment and color scheme are incorrect even though two reptile-like shapes are present.
level_3: The two specimens are shown side by side with correct labeling (female on the left, male on the right), but the coloration is only partly right: for example, the male appears green but lacks any visible blue spots, or the female appears pale green but lacks any visible brown striping; the two specimens also differ in size by more than roughly 20%, drawing attention away from the color/pattern comparison.
level_4: Layout and labels are correct (female left, male right); the male is a vivid green with some blue spotting visible, though the spots are sparse or uneven in size; the female is pale green with brown stripes that are faint or broken rather than clean and continuous; the core color/pattern contrast between the two sexes is still clearly readable despite these imperfections.
level_5: Two clearly rendered European green lizard specimens are shown side by side; the left specimen is labeled 'female' and shows a uniform pale green body with clear, continuous brown stripes running along its back; the right specimen is labeled 'male' and shows a vivid, saturated green body with distinct blue spots clearly visible along its sides; the two specimens are similar in size and framing, with no occlusion, and the labels are easy to read and clearly attached to the correct specimen.

Scientific and Causal Correctness rubric:
level_1: No sex-linked causal reasoning is conveyed at all: the two specimens are shown with no framing that their difference relates to sex or reproductive biology; or the video actively inverts the biology (e.g., a caption states blue spots indicate female sex, or brown stripes indicate male sex).
level_2: The video shows two differently colored/patterned lizards labeled by sex, but offers no explanation connecting coloration to sex, with no framing of the difference as sex-linked or biologically meaningful; or it attributes the difference to a clearly wrong cause (e.g., 'the male is greener because it basks in more sunlight').
level_3: The video frames the color difference as sex-linked (e.g., implies 'this shows how males and females differ') but the explanation stays superficial: e.g., it notes 'males are greener/brighter' without connecting this specifically to blue spotting or brown striping as diagnostic features, and without any reference to mate recognition or sexual selection.
level_4: The video correctly frames male bright-green-plus-blue-spot coloration and female pale-green-plus-brown-stripe patterning as sex-linked traits tied to reproduction (e.g., states or implies a role in mate recognition or sexual selection), and does not claim the pattern is purely environmental or a life-stage artifact; it may not go further into why each sex's pattern is specifically adaptive (e.g., does not mention camouflage benefits for females or signaling benefits for males).
level_5: The video fully connects the morphology to evolutionary causality: it conveys that the male's blue-spot/bright-green coloration and the female's brown-stripe/pale-green patterning arise from sexual selection, e.g., implying the male's high-contrast coloration aids in attracting mates or signaling condition to rivals, while the female's more cryptic striping may aid camouflage, without introducing an erroneous mechanism (e.g., does not claim the coloration is purely diet- or temperature-driven with no genetic/selective basis).

Spatiotemporal Consistency rubric:
level_1: The scene breaks basic physical consistency: the lizards flicker in and out of frame, the labels appear disconnected from the specimens they describe, the two lizards are shown under clearly different lighting, angles, or backgrounds, or one specimen appears to move/rotate while the other stays fixed.
level_2: Both specimens are in the same frame, but the viewing angles differ noticeably (e.g., the female shown face-on while the male is shown in profile); or the labels appear to sit at different depths (one looks like a physical tag, the other like a digital overlay); lighting creates visibly mismatched shadows or highlights between the two specimens; or a label appears only after a zoom or camera move, breaking the sense that both specimens were captured together.
level_3: The side-by-side layout is maintained, but there are minor inconsistencies: a slight difference in focus or sharpness between the two specimens, a visible lighting gradient across the frame (one side brighter than the other), or a different label font/size between the two specimens; the scene is static and identifiable, but does not read as a single, carefully matched comparison.
level_4: Both specimens are shown from a consistent, frontal viewing angle with even, diffused lighting and no harsh shadows or glare; the two specimens appear at a similar scale and sharpness; the labels share the same font, size, color, and placement beneath each specimen; there is at most one minor flaw (e.g., a faint reflection partly obscuring one blue spot).
level_5: The comparison reads as fully consistent: both specimens appear at the same scale, sharpness, and frontal viewing angle; lighting is even across the frame with no visible shadow or glare difference between the two sides; the labels look like they belong to the same physical display (same font, material, and placement, not a mismatched digital overlay on one side only); there is no flicker, motion, or sudden change in framing at any point in the clip.