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authorDaniel Silverstone <dsilvers@digital-scurf.org>2014-11-06 22:06:08 +0000
committerDaniel Silverstone <dsilvers@digital-scurf.org>2014-11-06 22:06:08 +0000
commitd6a7dd72c98d0cc6c84645680c144a9f994a4f0c (patch)
treec830742b63942e57913620d2c504868654439bbc
parentd2bbfe34811231d5b61ec5a1f733c60297ad5959 (diff)
downloadsnake-talk-d6a7dd72c98d0cc6c84645680c144a9f994a4f0c.tar.bz2
Initial talk
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+# Codethink Friday Talks - Snake Anatomy - Pinpoint
+
+[backing.png]
+[center]
+[font=Sans 50px]
+[stretch]
+
+--
+
+# A brief introduction to snakes...
+# Those who study snakes are often called "Herpetologists"
+# I am, as you know a little derpy, so...
+
+-- [backing-herp-derp.png]
+
+# Welcome to my little herp-derp
+
+--
+
+Kingdom: Animalia
+Phylum: Chordata
+Class: Reptilia
+Order: Squamata
+Clade: Ophidia
+Suborder: Serpentes
+
+# Animals, with backbones, reptiles, scaled, snakey things, snakes.
+#
+# Snakes are reptiles, cold blooded, sub-order Serpentes
+
+--
+
+Basic features, and distinguishing features
+
+# Ectothermic
+# Amniote - eggs with amnios (membrane) for fluid, for land eggs
+# Vertibrate - bones on the inside
+# Covered in scales (except in cases of unusual mutation)
+# Obligate carnivores
+# Exceedingly flexible jaw
+# No eyelids, unlike legless lizards
+# No external ears
+
+--
+
+Scales
+
+# Formed from the epidermis
+# Inner surface hinges back to overlap adjacent scale
+# Fixed number at hatching
+# Increase in size as the snake grows
+# Made of keratin
+# Differentiated scales form the rattle or spectacles
+# Rattle is added to at each shed, but can break off
+# Colourless (colour is from underlying skin pigmentation)
+
+--
+
+Shedding
+
+# Shedding, or Ecdysis occurs as the snake ages.
+# Young snakes moult more often (4-6 weeks when very young)
+# Adult snakes moult as little as once a year.
+# While known to allow growth in insects, this is disputed for snakes
+# When a snake first prepares to shed, no outward indication other than
+# maybe a loss of appetite
+
+-- [backing-blue.jpg]
+
+# "In blue" is when the inner layer of the outer scales dissolves
+# Colours are diminished due to the inner layer oils
+# Just before moulting the eyes then clear and the snake will
+# spend more time near water
+
+--
+
+The shedding itself
+
+# The snake breaks the skin around its mouth and then crawls out of the
+# old skin. Like peeling a sock off
+# Check for spectacles and tail tip
+#
+# See -- a shed!
+
+--
+
+Scale arrangement
+
+# Except on the head, snake scales overlap as described earlier.
+# Scales on the head are thicker and don't overlap. These are often
+# called shields, or plates.
+# Tummy has large scales, very slippy, good for locomotion.
+
+--
+
+Snakes are bilaterally symmetric
+
+-- [backing-anatomy.png]
+
+# Snakes do have paired organs such as lungs, kidneys, testes etc.
+# Not always are both of a pair useful, e.g. many snakes only
+# have vestigial left lung.
+# Heart in a sac to help it move when food moves down the oesophagus
+# Unusual placement of organs, see how some start and end overlapped
+
+--
+
+Locomotion
+
+# Snakes typically move with lateral undulation -- this is where the
+# snake tacks left and right in waves -- Most common and the same
+# cost of transport as lizards of similar mass -- employed by
+# both land and sea snakes.
+
+-- [backing-sidewinder.png]
+
+# Sidewinding, employed when the environment lacks the irregularities
+# needed for lateral undulation. (e.g. mud or sand). In this only
+# half the body at a time moves, the rest remains in contact to minimise
+# slippage. Also low caloric cost.
+
+--
+
+Concertina, Rectilinear, Flying?!
+
+# Concertina -- bunches up, braces, stretches, invert, repeat.
+# Rectilinear, direct forward motion, slowest form of motion but used
+# for stalking prey across open ground.
+
+# Some snakes launch themselves from branches, undulate in the air and
+# can achieve controlled glides of 100s of feet and can turn in the air!
+
+--
+
+Venom? Constrict? Forage?
+
+# Various infra-orders of snakes, some of which are venemous, some
+# are constrictors, some simply forage for either motionless food such as
+# eggs, or already dead lizards.
+
+-- [backing-onhand.png]
+
+Alethinophidia
+Core Alethinophidia
+Macrostomata
+Caenophidia
+Colubridae
+Pantherophis Guttatus Guttatus
+
+# My snake, Kellogg, is a Corn Snake, Corn snakes are collubrids which is
+# a constricting infra-order of snakes. So to get to Corn snakes, we're
+# now eleven layers down the classification tree.
+
+-- [backing-onhand.png]
+
+Genetics
+
+# Because Corn Snakes are kept as pets, there's a lot of research into their
+# genetic makeup. Different "designs" of snake are called morphs.
+# Kellogg is a Motley Corn Snake.
+# High level traits such as anerythristic, amelanistic, striped, spotted,
+# etc.
+
+-- [backing-tessera.png]
+
+# Very striking morphs such as this anerythristic tessera have a number of
+# bred traits such as the very striking stripe along the back, the motley
+# esque side pattern, and of course, the absence of red and yellow pigmentation
+# which results in this beautiful monochromatic snake.
+
+--
+
+More Genetics
+
+# Some traits are single-allele
+# Some are multi-allele
+# Some are dominant or recessive or co-recessive
+# We talk about 'het for XXX'
+# Huge numbers, see the wikipedia page on corn snakes for a large list
+# Usual issues regarding inbreeding for the more "complex" morphs
+
+--
+
+A Song of Reproduction
+
+# Corn snakes are easily bred, but need brumating for 60-90 days.
+# Breeding is shortly after the winter cool
+# Snakes lay broods of 12-24 eggs and then go away and never return.
+# Shells are leathery and eggs usually hatch after around 10 weeks
+# Newborn corns are roughly 10 to 15 cm long
+
+--
+
+And finally...
+
+# Richard Maw may want shade his eyes, but I thought I'd show you video
+# of Kellogg eating, and explain a little about what is going on.
+
+# https://plus.google.com/u/0/photos/109098675742430569483/albums/6058586949191989809/6066797722797226434
+
+--
+
+Any Questions?
+
+
+--
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