Wildlife Senses Flashcards
What is Visual Acuity?
The ability to form sharp images
Example of a group with well developed visual acuity
birds
What is visual sensitivity?
The ability to form images in dim light. Involves the tapetum lucidum
What is the structure that helps animals have good visual sensitivity?
Tapetum lucidum
What group has well-developed visual sensitivity?
Mammals
Characteristics of animals with round pupils
actively chase down their prey in the daylight. Usually predators that don’t need to avoid attack
Characteristics of vision with round pupils
Not a wide field of view
Examples of animals with round pupils
Dogs, wolves and big cats
Characteristics of animals with vertical slit pupils
small ambush predators that hunt close to the ground
Characteristics of vision with vertical slit pupils
greater expansion so more light can get in
Examples of animals with vertical slip pupils
cats, foxes, crocidiles
Characteristics of animals with horizontal slit pupils
prey animals
Characteristics of vision with horizontal pupils
wide field of view to scan for predators. Keeps the ground in sharp focus
Examples of animals with horizontal slit pupils
sheep, goats and horses
characteristics of animals with crescent pupils
live in water
characteristics of vision with crescent pupils
enhances vision by decreasing distortion in water. wide field of view to watch for predators and prey. Boosted contrast
Examples of animals with crescent pupils
stingrays, flatfish, catfish
Characteristics of vision with W shaped pupils
light can enter from many directions to boost contrast and distance vision
Example of animals with W shaped pupils
cuttlefish
Characteristics of vision with Vertical Beaded Pupils
perceive distance well and can hunt in variety of environments
Examples of animals with vertical beaded pupils
geckos and some fish
Examples of signals that can come from visual cues (4)
Group cohesion, warnings and dominance
Why do mammals have well-developed olfactory sensing?
Because of our nocturnal activity
Which mammal group doesn’t have an olfactory lobe?
Cetacea
Example of non-mammal group with highly developed olfactory lobe
Birds
Examples of signals that can come from olfactory cues (5)
food sites, reproductive status, alarm signals, dominance, territory boundaries