communication Flashcards
define communication
Information is exchanged among individuals
– One animal responds to signals sent out by another animal
communication depends on their ability to _______ messages
perceive
human communication is primarily ______
auditory
animal communication siganls
visual
olfactory
auditory
visual acuity depends on: (2)
- Keenness of perception
- Acuteness or clearness of vision
visual acuity represents the ________ size that can be reliably identified
smallest
what is visual acuity of 20/20?
frequently described as meaning that a person can see detail from 20 feet away the same as a person with normal eyesight would see from 20 feet
what is visual acuity of 20/40?
– see detail from 20 feet away the same as a person with normal eyesight would see it from 40 feet away
what is the maximum acuity of the human eye that is superior to 20/20
20/10
visual acuity of horses
20/30
visual acuity of dogs
20/85
visual acuity of cats
20/100-200
visual acuity of cattle/pigs
20/200
visual acuity of eagles
20/5
predators have _______ vision
bifocal
what does bifocal vision allow for?
– Allows excellent form & depth perception
– Accurate estimates of distance to objects
all species of domestic animal possess _____ vision and will discriminate based on this.
color
Cats, dogs, horses, cattle, pigs, goats, sheep
dogs have shades of which colors?
violet, blue, yellow
describe cat vision
limited
– detectable capacity for color vision if the stimuli are large and differ greatly in spectral content (color)
color vision is relatively poorly developed in _____ vs primates, birds, and fish
ungulates
list the characteristics of vision in grazing animals:
– Wide set eyes – Panoramic view of world – spot predators – Blind spot – Wide range of monocular vision – Limited binocular vision