Ornithology Communication Unit Avian Senses Birds have highly

Ornithology Communication Unit

Avian Senses • Birds have highly developed sight - they see into the near ultraviolet spectrum • Birds hear better than mammals - they hear ultra-low frequencies • They navigate by using the earth’s magnetism

Avian Intelligence • Avian learning is equal to or better than most mammals • They master complex problems better than most mammals in advanced learning experiments

Avian Intelligence Cont’d • Explain bird experiment • Cats, rabbits, chickens and pigeons do poorly • Dogs and crows solve it immediately

Avian Intelligence Cont’d • Mammals count poorly - 21, 000 trials on average to teach a monkey to count • Birds master counting quickly • Ravens and parakeets easily learn to count to 7

Insight Learning • Insight learning is using learned information in a new situation • Egyptian Vultures use rocks to break ostrich eggs

Insight Learning Cont’d • Woodpecker finches in the Galapagos Islands use sticks to dig insects out of trees, logs and stumps

Avian Memory • Birds have a good memory • This is due to a well developed hippocampus

Avian Memory Cont’d • They remember food sources, nest sites and locations of remote wintering grounds • Titmice cache up to 50, 000 seeds • Birds may remember as many as 2, 000 cache sites up to 9 months

Avian Vision • They see much better than mammals, in some cases they see details 2. 5 to 3 times farther than mammals • Their eyes are large Eagles and owls have eyes as large as humans

Avian Vision Cont’d • Their eyes can be round to flat in shape but have limited movement abilities • They have to move their heads to see different things

Avian Eyes • Eyes are on the sides of their head • They see better to the side than in front of them • They view close objects with one eye at a time

Avian Eyes Cont’d • Using one eye creates a flatter image • The image lacks good depth perception • To counter this they bob their heads rapidly to view the object from two different angles

Color Vision • Birds have very good color vision • It’s probably better than ours because they have cones (color sensitive cells) and colored oil droplets in their eyes that we don’t have

Hearing • Similar to that of mammals • Have special features to protect the inner in diving birds • Have no external ear- some have a funnel depending on their hearing abilities • Some owls have a muscle around the funnel that amplifies sounds

Taste • They probably don’t taste as well as we do • They usually have 25 -75 taste buds on their tongue • We have roughly 10, 000 taste buds

Smell • Probably not as good as most mammals • Exceptions are turkey vultures and night hunters

Communication • Birds communicate in various ways • Use displays for mating and territorial defenses • Have specific means for species recognition, locating each other and warning each other of danger

Visual Communication • Color patterns can communicate several things • Drab colors are great for concealment (think woodcock) • Bright colors are for gaining attention, which could mean various things

Visual Identity • Often use head and face color patterns • Imprinting of species identification takes place early, as a chick in the nest

Colors and Contrast • Solid colors are more conspicuous • Contrasting edges make noticeable signals • Regular repetition of shapes gain attention also

Species Recognition • Head patterns seem to be a key for most species • They learn to identify species at an early age, usually in the nest

Species Recognition • Determines mate selection • Offspring of white snow geese choose white mates and offspring of blue geese choose blue mates

Human Imprinting • Wild birds raised by humans will associate them as their family • Often young are raised with puppets to avoid this

Individual Recognition • Use plumage patterns, size, voice and behavior

Displays • Repetitive behaviors that usually are a combination of visual and vocal communication

Displays • Displays seem to be inherited behaviors. The closer the relation, the more similar the behavior • Ex: Throat kinking of anhingas and cormorants

Ritualized Behavior • Repeated behaviors specific to a species • Ritualized feeding is a good example • Males bow, spread wings and give a food call

Precision • These behaviors are usually very precise • Ex: Common goldeneyes “head throw” lasts 1. 3 sec with a standard deviation of 0. 08 sec

Indication of Intent • Ritualized behavior can indicate the intentions of a bird • Ex: When stellars jays raise their crest, they warn enemies that they are about to attack

Variety of Displays • Many species have more than one display • Great blue herons have 15 that mean everything from breeding intent, territorial marking, switching incubation shifts and pair bonding

Agonistic Behavior • A complex mixture of aggression and escape behaviors • Two birds are interacting, both have a selfish interest • It can lead to hostility or cooperation • They use these to avoid contact and injury

Agonistic Behaviors • They emphasize the bill and wings as weapons

Vocal Communication • Birds have the greatest sound producing abilities of all vertebrates • Work well for communicating over long distances, at night and in dense cover

Recognition • Distinct calls and songs allow birds to determine the senders species and individual recognition