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Lecture 12

BIOL 1902 Lecture 12: capturing/killing prey

by Lia

Department
Biology
Course Code
BIOL 1902
Professor
Michael Runtz
Lecture
12

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Class 12
Capturing Prey (Cont.)
Traps
Flight Intercept traps are meant to trap flying animals.
- Some spider webs are Flight Intercept Traps
- Orb-weaver spiders weave orb-shape webs
Argiope spiders have webs that they use as Flight Intercept Traps
- They have a Stabilimentum on their webs that is a highly visible silk on the middle of
the web, it emits UV patterns that plants do, attracting insects by making them think it is
a plant
- Spider’s body also has that same UV pattern, aiding in the masquerade of a plant.
Pitfall traps are traps made in the ground, in a form of a ‘pit’
- Ant-lion larvae hide in pits, buried in, and wait for ants to appear to eat them.
- Mole-tunnels can be considered as a pitfall trap, if prey falls in, it will eat them.
Aggressive Mimicry is using the body to look like something to attract prey
- Alligator Snapping Turtle open their mouth and use their tongues to look like worms
that fish are lured to and eaten
- Angler Fish has an appendage on its head that is used to attract fish to eat.
Funnel Weaver Spiders build webs on the ground, targetting things that would step on them.
Sheet-web Spiders create webs consisting of two components; sharp edges for insects to trip
and fall down in the sticky second component, the bowl.
Spider Webs Facts
- Spider Webs are Hygroscopic meaning they absorb moisture.
- Webs can contain 6 or more types of silk
- Spiders can recycle silk from broken webs
Mouth
Most mammals have canines for hunting.
Golden Eagles have a Meathook tip (their beak is in the form of a hook.)
Mergansers (Ducks) have long narrow beaks with serrated edges (like serrated edges of a
knife) to catch fitch
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