BIOL 1902 Lecture Notes - Lecture 12: Boreal Owl, Vomeronasal Organ, Cool Air
5 Jul 2017
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Predation
• Rods= a uh of rods to oe sesor euro. Coes It’s a 1-1 relationship so each cone has to
be hit with light. This is why rods are more sensitive with a bit of light. Their image is not as
sharp though
• Hearing
o Wide head= horizontal separation
o Asymmetrical ear opening= vertical separation
o Together= pinpoint exactly where the ear comes from
o The more nocturnal the owl the better their hearing (boreal owl most nocturnal most
exaggerated those two things)
• Bats
o Also produce sounds to find their prey
o This is called= echolocation
o It is ultrasoud ad e a’t hear it.
o When it hits something they will increase the frequency of calling to pinpoint where it is
o Each species will have specific soundbites
• Other mammal that uses ultrasound to find animal: dolphins, shrews
o They find insects in the ground and is found locally in Ontario
Smell
• Primary mammalian
• Elongated snout= olfactory sense
• Voeroasal orga= jaoso’s orga
• Flee posture to epose jaoso’s orga
• They hunt more at night= power of smell works better at night at dusk you have cool air going
down on the ground that has retained some heat from the day and so the scent of the animal
that alks ad rus its od o the groud is trapped the ool air that’s going down longer
and scent trails are easier to track at dusk
• Snakes use their tongues to catch airborn scent molecules. Whichever fork of the tongue has
more molecules, this is where the scent comes from. This is why they stick their tongues out so
much. Also use jaoso’s orga.
Tactile sense
• Raccoons have touch-sensitive front paws
• The rai of the raoo shos that there’s a lot ore rai ells dediated for tatile sese of
the front paws
• River otters have a lot of specialized hairs and when they touch something this sends a signal to
their brain. Those special hairs are called vibrissae
• Foxes have them too.
• Birds have feathers that look like hairs that have sensory cells at their base they are called rictal
bristles. It’s elieed the irds fl aroud ad those ristles help the fid ugs
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Document Summary
Predation: rods= a (cid:271)u(cid:374)(cid:272)h of rods to o(cid:374)e se(cid:374)sor(cid:455) (cid:374)euro(cid:374). Co(cid:374)es it"s a 1-1 relationship so each cone has to be hit with light. This is why rods are more sensitive with a bit of light. Whichever fork of the tongue has more molecules, this is where the scent comes from. This is why they stick their tongues out so much. Those special hairs are called vibrissae: foxes have them too, birds have feathers that look like hairs that have sensory cells at their base they are called rictal bristles. It"s (cid:271)elie(cid:448)ed the (cid:271)irds fl(cid:455) arou(cid:374)d a(cid:374)d those (cid:271)ristles help the(cid:373) fi(cid:374)d (cid:271)ugs: star (cid:374)osed (cid:373)oles are predator(cid:455) a(cid:374)d (cid:272)at(cid:272)h (cid:449)or(cid:373)s a(cid:374)d i(cid:374)se(cid:272)ts a(cid:374)d ha(cid:448)e ei(cid:373)er"s orga(cid:374)s i(cid:374) their (cid:374)ose protu(cid:271)era(cid:374)(cid:272)es. It"s the (cid:373)ai(cid:374) orga(cid:374) for the(cid:373) to fi(cid:374)d prey: as they touch things with those protuberances they can tell if they are edible or not, sandpipers have herbst corpuscles in the tip of their bill.
