Definition: To raise the feathers on the back of a bird's neck, often as a sign of anger or fear.

Example: The cat's presence made the bird's hackles rise in alarm.

Definition: A tuft of feathers on a bird's neck or back, often used in fishing flies, or the stiff hairs along the back of an animal's neck.

Example: The fisherman tied a hackle to his fly to attract more fish.

Definition: To cut or chop something in a rough or uneven way, often resulting in a mangled appearance.

Example: He decided to hackle the wood to create a rustic look for the furniture.

Definition: A type of dinosaur that lived during the Upper Cretaceous period, known for its flat snout and often having a crest on its head. These dinosaurs were herbivores and walked on two legs.

Example: The hadrosaur was one of the most common dinosaurs in its time, often seen grazing in herds.

Definition: A type of primitive fish that has an eel-like shape and a round mouth without jaws, which it uses to suck and feed on other fish and invertebrates.

Example: The hagfish is known for its ability to produce large amounts of slime when threatened.

Definition: A small mass of hair that forms in the stomach or intestines of an animal, especially a cat, when it swallows hair while grooming itself.

Example: My cat often coughs up a hairball after grooming.

Definition: Having more hair than something else or than usual.

Example: The dog is hairier than the cat.

Definition: The most covered with hair; having a lot of hair.

Example: The dog was the hairiest in the competition, with fur that seemed to go on forever.

Definition: The quality or state of having a lot of hair on the body or surface.

Example: The hairiness of the dog made it look very fluffy and cute.

Definition: A type of small butterfly that belongs to a specific subfamily, known for having streaks on the underside of its wings and fine hair-like projections on the hind wings.

Example: The hairstreak fluttered gracefully among the flowers in the garden.

Definition: A type of long, thin worm that lives as a parasite in the stomachs of animals like cattle and sheep, and can also be found in water as adults.

Example: The farmer noticed that some of his sheep were infected with hairworms, which affected their health.

Definition: A type of slender fish found in warm waters, known for its long lower jaw and silvery body. These fish are often found in tropical freshwater environments.

Example: The aquarium was filled with colorful halfbeaks swimming gracefully among the plants.