Domain: Natural Science — Morphology
Target concept: Sexual dimorphism in the gray wolf of North America: robust snout in males and slender snout in females.

Video generation prompt: The figure shows two North American wolves with their sexes labeled. The one on the left is a female, and the one on the right is a male. Observe them from the side and front to compare the thickness and length of their snouts.

Evaluation guide:
(i) Target concept: Visual verification of sexual dimorphism in North American gray wolves (Canis lupus) via direct side-by-side comparison of snout robustness between a labeled female and a labeled male.
Minimum mechanism: Two anatomically accurate Canis lupus individuals must be rendered with fixed, observable craniofacial geometry; sex labels must be semantically and spatially bound to the correct subject (left = female, right = male); viewpoint geometry must permit unoccluded observation of snout cross-section (side) and frontal aperture (front); because snout-robustness differences between wolf sexes are comparative rather than absolute, both individuals must remain simultaneously visible at matched scale and pose so the relative width and depth of each snout can be judged against the other wolf, not against a fixed external standard.
(ii)Storyline: [Phase 1] Stable wide shot reveals two wolves in fixed side-by-side spatial relationship with clear 'Female' (left) and 'Male' (right) labels adjacent to each. [Phase 2] Camera smoothly transitions (or splits) to simultaneously expose the lateral profile of both heads: each snout contour must be fully traceable from forehead to nose tip so the two can be compared directly. [Phase 3] Camera smoothly transitions (or splits) to a frontal view: the nasal bone structure of both wolves must be fully visible and directly comparable in width. [Phase 4] No intervening objects, motion blur, or lighting shifts disrupt continuity between phases; the snout region of both wolves remains the visual focus across all viewpoints, held at matched scale. [Phase 5] All morphological features remain stable and internally consistent: no deformation, scaling mismatch, or species-incongruent trait emergence (e.g., domed forehead, shortened rostrum).

Manual:
Experimental Procedure
1. Display two North American gray wolves side-by-side in the same scene.
2. Label the left wolf 'Female' and the right wolf 'Male'.
3. Show both a side (lateral) view and a front (anterior) view of both wolves at matched scale, keeping both wolves visible together so their snouts can be compared directly.
Observation of Experimental Phenomena
The female (left) displays a slender snout: in side view, a narrow vertical height and a tapered projection; in front view, a narrow triangular nasal outline with no broad base. The male (right) displays a comparatively robust snout: in side view, greater vertical depth and a blunter, thicker projection; in front view, a broader nasal outline with a wider flare at the base.
Summary of Experimental Principles
Sexual dimorphism in North American gray wolves: males have comparatively robust (thicker, broader) snouts, while females have comparatively slender snouts — a difference best judged by direct side-by-side comparison between the two wolves rather than by absolute measurement.

Prompt Grounding rubric:
level_1: Fewer than two North American wolves are shown, or only one wolf appears; or the wolves are not labeled by sex at all, or a label is illegible; or the video never shows either a side view or a front view of the wolves.
level_2: Two wolves are shown and labeled, but the labels fail to distinguish one female and one male (e.g., both labeled female, both labeled male, or the labels are swapped so the right wolf reads female); or only one viewpoint (side OR front) is ever shown, never both; or the two wolves are not placed in the same scene side by side (e.g., they appear in separate cuts).
level_3: Two North American wolves are shown together in the same scene, correctly labeled left = female and right = male; both a side (lateral) view and a front (anterior) view of both animals appear at some point in the video, either sequentially or via a split/composite frame; no other animals or people appear in the shot.
level_4: Two North American wolves stand together in one scene, correctly labeled female (left) and male (right), with both a side view and a front view of both animals shown in the clip; the labels sit directly next to the correct wolf with no overlap between them; both wolves are clearly recognizable as gray wolves (erect ears, bushy tail, a non-domestic head shape, not fox- or dog-like); the snout region of both wolves is fully visible and unobstructed by fur, branches, or camera angle in both viewpoints.
level_5: Everything described for score 4 is present, and in addition both wolves are held at matched scale and a comparable head orientation in at least one shot so their snouts can be compared directly side by side; both snout regions stay visible in both the side and front views without cropping or motion blur; the frame contains only the two labeled wolves, with no added text, arrows, or graphic overlays beyond the two sex labels.

Scientific and Causal Correctness rubric:
level_1: The depicted snout morphology contradicts the known sex pattern: e.g., the wolf labeled male has the more slender snout, or the wolf labeled female has the visibly thicker or broader snout; or both wolves show identical snout thickness and length with no visible difference; or a snout is rendered as anatomically implausible (fox-like, dog-like, or cartoonishly exaggerated).
level_2: A snout difference between the two wolves is visible but runs the wrong direction or is inconsistent across views: e.g., the male's snout looks thicker in the side view but not in the front view, or the female's snout looks just as thick as the male's in one of the two viewpoints; or a snout shape deviates from gray wolf anatomy (upturned, foreshortened, or beak-like).
level_3: The female (left) shows a visibly slender snout (narrow in lateral profile with a tapered nose tip, and narrow in frontal view), while the male (right) shows a visibly more robust snout (noticeably greater depth in lateral profile and a broader base in frontal view); the difference is visible when the two wolves are compared directly, in both the side and front views.
level_4: Everything described for score 3 is present, and in addition the contrast reads consistently across both viewpoints: in the side view, the male's snout is visibly deeper front-to-back near the bridge than the female's, while the female's snout tapers more sharply toward the tip; in the front view, the male's nasal region shows a visibly wider base than the female's narrower, near-vertical outline, with no frame in which the two snouts look equally thick.
level_5: Everything described for score 4 is present, and in addition the snout contrast is reinforced by at least one further visible dimorphic cue consistent with the male being the more robust individual (e.g., the male's head or jawline reads as proportionally broader or heavier than the female's), so a viewer comparing the two wolves side by side sees the robust-male / slender-female pattern confirmed by more than the snout alone.

Spatiotemporal Consistency rubric:
level_1: One or both wolves jump to a different position between frames with no motion shown in between; or the video cuts abruptly from the side view to the front view with no shared frame or transition; or one of the two wolves is missing from the frame for a stretch of the video and then shows back up with no visible entrance; or the direction of the cast shadows reverses between shots with no matching change in a visible light source.
level_2: The camera or scene changes are jarring but not a full break in continuity: e.g., the video cuts from a side view of the left wolf straight to a front view of the right wolf with no establishing shot connecting them; or a wolf's position or facing direction changes between the side and front views without any visible turning motion; or the background behind the wolves visibly warps or flickers between shots.
level_3: The two wolves stay in the same side-by-side arrangement throughout the video; the change from side view to front view happens either through a smooth camera pan, rotation, or zoom, or through a stable split-screen composition; the lighting on the wolves and the background looks the same across the transition; neither wolf is cropped, warped, or shows any part of its body breaking apart.
level_4: Everything described for score 3 is present, and in addition both wolves keep the same pose, apparent size, and depth relationship to the camera across the whole video: neither wolf appears to shift closer or farther, or grow or shrink, relative to the other between the side and front views; the snout region of both wolves stays clearly visible with no visible flicker or wobble as the viewpoint changes.
level_5: Everything described for score 4 is present, and in addition there is no motion blur across the snout region strong enough to obscure its outline; the relative depth of the two wolves stays visually plausible throughout (neither looks implausibly closer or farther without a matching camera move); there is no visible frame freeze, skip, or repeated frame; any camera movement is smooth and physically plausible rather than snapping instantly between viewpoints.