Birds of Prey Honor

Nature Study

Requirements

1. What are the characteristics of birds of prey? What are the advantages of the beak shape of birds of prey?

   Answer: CHARACTERISTICS: a curved, sharp beak for tearing meat, strong claws (talons) for grasping prey, exceptional vision (up to 8x better than a human's), fast and silent flight, predatory habit. ADVANTAGES OF THE BEAK: the curved tip allows it to tear off pieces of meat; the sharp lateral edges cut tendons and muscles; its proportional size allows it to reach meat between bones. — An eagle's beak has ~5x the pressure force of a human's. The American bald eagle can see a mouse at 1km. An owl turns its neck 270° due to its extra number of vertebrae (human: 7, owl: 14). A hawk's talons exert a pressure of up to 200kg to crush the prey's spine. These characteristics were adapted by evolution for efficient hunting.

2. What is a saprophagous habit? Which species of vulture does not have this habit?

   Answer: SAPROPHAGOUS HABIT: feeding on DEAD organic matter (carcasses). Most vultures are saprophagous — a classic example of "nature's cleaners." EXCEPTION: the PALM-NUT VULTURE (Gypohierax angolensis), also called the vulturine fish eagle, is mainly FRUGIVOROUS — it feeds mainly on the fruit of the oil palm (palm nut). — Saprophagy is a vital ecological function — without vultures, carcasses would rot and spread diseases. Vultures have extremely acidic gastric juices (pH 1) that kill bacteria and even anthrax spores. The palm-nut vulture is the only exception in the group — its diet is 60-90% plant-based (palm nuts), with only a small animal supplement now and then.

3. What are the advantages of ultraviolet vision for the birds that have this capability? Name a species of bird of prey that has ultraviolet vision.

   Answer: ADVANTAGES: they detect rodent URINE (which reflects UV) — discovering trails invisible to the human eye and identifying areas with many prey. They also see UV patterns in flowers and in the plumage of other animals (camouflage invisible to the predator). Species: the ROUGH-LEGGED HAWK (Buteo lagopus, the feathered-legged hawk) has this proven capability. — UV vision is one of the most spectacular evolutionary advantages of birds of prey. Studies from Lund University (Sweden) proved that mouse urine emits UV reflection detectable from 100m up in the air. This advantage is inaccessible to mammalian predators (which cannot see UV). That is why diurnal birds efficiently dominate rodent control in open fields.

4. Why are nocturnal birds of prey so efficient as predators?

   Answer: NOCTURNAL EFFICIENCY: (1) asymmetrical HEARING (ears at different heights) that triangulates the prey's position by sound; (2) SILENT FLIGHT (feathers with serrated edges absorb sound — disrupting turbulence); (3) VISION in low light (100x more sensitive than human, a retina rich in rods); (4) HUNTING at a time of less competition (few predators active at night). — The barn owl can catch a mouse in TOTAL darkness using only its hearing — proven in a laboratory. The serrated feathers on the edge of the wing break the airflow, eliminating the noise typical of other birds. Night vision depends on the rods (the owl has 95% rods vs. 5% cones — humans have 25%/75%). Spectacular evolutionary adaptations.

5. Give an example of a species for each of the items below, citing the common and scientific names:
   • Accipitrids (Accipitridae);
   • Cathartids (Cathartidae);
   • Falcons (Falconidae);
   • Ospreys (Pandionidae);
   • True owls (Strigidae).

   Answer: 1) Accipitrids (Accipitridae): black hawk-eagle (Spizaetus tyrannus). 2) Cathartids (Cathartidae): king vulture (Sarcoramphus papa). 3) Falconids (Falconidae): southern caracara (Caracara plancus). 4) Pandionids (Pandionidae): osprey (Pandion haliaetus), the only species of the family (a monotypic family, with only 1 species in the world). 5) Strigids (Strigidae): burrowing owl (Athene cunicularia). — Pandionidae is a monotypic family — only Pandion haliaetus exists in it worldwide. Cathartidae are New World vultures (the Americas), different from Old World vultures (Accipitridae). Strigidae are the true owls (≠ Tytonidae, which are barn owls). Knowing the family helps identify the behavior and habitat of birds of prey spotted in the field.

6. Describe the hunting techniques of the orders below:
   • Accipitriform;
   • Falconiform;
   • Strigiform.

   Answer: 1) Accipitriformes (hawks, eagles): they fly high searching for prey visually and, upon spotting it, descend in a fast dive (stoop); they grab the prey with their talons (strong claws) and kill it by the pressure of the claws. 2) Falconiformes (falcons): they hunt in mid-flight, diving at very high speed (the peregrine falcon exceeds 300 km/h, being the fastest bird); they strike or grab other birds in the air. 3) Strigiformes (owls): they hunt at night with completely silent flight (feathers that muffle the sound); they use keen, triangulated hearing to locate prey in the dark and capture small mammals with their talons. — The peregrine falcon is the fastest ANIMAL on the planet — 389 km/h recorded in a dive. The golden eagle can carry prey of up to 4 kg (a small lamb). The barn owl catches a mouse in total darkness using only its hearing. Each order has a technique adapted to the habitat and the type of prey preferred by the species, evolved over millions of years of adaptation.

7. What are the morphological differences between eagles, hawks, and falcons? Illustrate.

   Answer: Eagles are large, robust, with a curved beak and feathered tarsi; hawks are medium-sized, with broad wings and a long tail for maneuvering in the forest; falcons are smaller, with pointed wings, a narrow tail, and a tomial tooth on the beak for taking down prey in flight. Examples: Golden eagle (Aquila chrysaetos): large and robust, curved beak and feathered tarsi, lives in mountains and open fields. Roadside hawk (Rupornis magnirostris): medium-sized, broad wings and long tail for maneuvering between trees, common at forest edges and in cities. Peregrine falcon (Falco peregrinus): smaller and fast, pointed wings and a narrow tail, with a tomial tooth on the beak — it dives at over 300 km/h to take down birds in mid-flight. — This morphological division reflects the niche of each group: eagles (large Accipitridae) hunt medium-sized mammals; hawks (smaller Accipitridae) ambush in dense vegetation; falcons (Falconidae) use speed in open fields and the tomial tooth to break the prey's cervical vertebra.

8. Identify, through images, photos, or in person, at least 10 species of birds of prey.

   Answer: Reconheça pelo menos 10 espécies de aves de rapina, observando silhueta, tamanho, bico, garras e plumagem: (1) Gavião-carijó (Rupornis magnirostris); (2) Gavião-pega-macaco (Spizaetus tyrannus); (3) Harpia / gavião-real (Harpia harpyja); (4) Urubu-rei (Sarcoramphus papa); (5) Caracará / carcará (Caracara plancus); (6) Carrapateiro / gavião-carrapateiro (Milvago chimachima); (7) Falcão-peregrino (Falco peregrinus); (8) Coruja-buraqueira (Athene cunicularia); (9) Suindara / coruja-da-igreja (Tyto furcata); (10) Jacurutu / corujão-orelhudo (Bubo virginianus). — Visual identification trains the Pathfinder to notice key features (silhouette in flight, tail pattern, facial pattern in owls) and to use field guides such as Wikiaves; the harpy eagle (Harpia harpyja) is the largest eagle in the Americas, with a wingspan of up to 2 m.

9. Name species of birds of prey that are threatened with extinction. What are the main causes of death of medium and large birds of prey?

   Answer: The harpy eagle, the crowned solitary eagle, the plumbeous hawk, and the crested eagle are threatened. The main causes of death are deforestation and habitat loss, illegal hunting and shooting, electrocution on power lines, lead or pesticide poisoning, and being run over on highways. — Top-of-the-chain birds need enormous territories (the harpy eagle uses 50 km² per pair) and that is why deforestation is the dominant factor; the IUCN lists the harpy eagle as Vulnerable and the crested eagle (Morphnus guianensis) as Near Threatened on the global red list of species.

10. Explain how the presence of birds of prey is an indicator of biodiversity in a region.

    Answer: Birds of prey occupy the top of the food chain and depend on varied prey and a preserved habitat. Where there is a harpy eagle, crowned solitary eagle, or peregrine falcon breeding, there is a complete ecological network beneath it: rodents, birds, reptiles, and healthy vegetation supporting everything. — That is why ecologists call these birds flagship or umbrella species: protecting one harpy eagle indirectly preserves the entire ecosystem around it; a pair needs about 50 km² of continuous forest and stable populations of sloths and monkeys to survive.

11. Which bird of prey has the fastest flight in the world?

    Answer: The peregrine falcon (Falco peregrinus) has the fastest flight in the world. In a hunting dive (called a stoop) it exceeds 320 km/h, making it the fastest animal on the planet. In level horizontal flight it maintains between 70 and 90 km/h, still far above other raptors. — The peregrine achieves this speed thanks to an aerodynamic body, nostrils with tubercles that divide the high-pressure air, and a third eyelid that protects the eyes during the dive. The documented record is 389 km/h, reached by the female Frightful belonging to biologist Ken Franklin.

12. Explain Isaiah 40:31

    Answer: Isaiah 40:31 says that those who wait on the Lord will renew their strength, will mount up with wings like eagles, will run and not grow weary, will walk and not faint. The eagle symbolizes renewal, spiritual strength, and total dependence on God, showing that trusting in the Eternal One brings energy to face trials. — The image refers to the molting of the eagle's feathers, a periodic process that renews its wings and restores its flight strength; Ellen White comments on the text in The Ministry of Healing (p. 469), associating physical and spiritual renewal with the time spent in communion with God through prayer.