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Hibernationand migration

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about migration and hibernation

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Hibernationand migration

  1. 1. Hibernation andHibernation and MigrationMigration WALT: to know what migration andWALT: to know what migration and hibernation ishibernation is WILF: to recall key factsWILF: to recall key facts Collate information about bird migrationCollate information about bird migration
  2. 2. AdaptationAdaptation  People are always having to adapt orPeople are always having to adapt or change to different situationschange to different situations  For animals adaptation can be aFor animals adaptation can be a matter of life and deathmatter of life and death  How do we adapt when winter comes?How do we adapt when winter comes?
  3. 3. How do animals prepareHow do animals prepare for winter?for winter?  Some head forSome head for warmer climates-warmer climates- migrationmigration  Some will put on aSome will put on a thick coat of furthick coat of fur  Some animals headSome animals head underground for aunderground for a long winter’s naplong winter’s nap
  4. 4. What is hibernation?What is hibernation?  This is a veryThis is a very special kind of deepspecial kind of deep sleepsleep  It is brought on byIt is brought on by short day lengths,short day lengths, cold temperaturescold temperatures and food shortagesand food shortages
  5. 5. Why do animalsWhy do animals hibernate?hibernate?  It is a survival strategyIt is a survival strategy  Dropping into a deep hibernationDropping into a deep hibernation means animals are using less energymeans animals are using less energy  Food is scarceFood is scarce  Animals miss the cold seasonsAnimals miss the cold seasons
  6. 6. What are the dangers ofWhat are the dangers of hibernation?hibernation?  The animal isThe animal is defenceless, whichdefenceless, which means it maybemeans it maybe attacked byattacked by predators andpredators and eaten!eaten!
  7. 7. How do animals prepareHow do animals prepare for hibernation?for hibernation?  They try to put on as much fat as possibleThey try to put on as much fat as possible because they wont be eating much duringbecause they wont be eating much during the winterthe winter  This is called brown fat, which is foundThis is called brown fat, which is found across the back and shoulders, close to anacross the back and shoulders, close to an animal’s organsanimal’s organs  Brown fat works hard to deliver quick energyBrown fat works hard to deliver quick energy to an animal coming out of hibernationto an animal coming out of hibernation
  8. 8. Light SleepersLight Sleepers  Some animals are not true hibernatorsSome animals are not true hibernators  They are easily awakened during theirThey are easily awakened during their winter slumberswinter slumbers  These animals breathe a little more slowlyThese animals breathe a little more slowly and lower their body temperature a fewand lower their body temperature a few degreesdegrees  The wake up to forage between winterThe wake up to forage between winter snowssnows  Bears, skunks, raccoonsBears, skunks, raccoons
  9. 9. Can you think of anyCan you think of any animals that hibernate?animals that hibernate? BearBear hedgehoghedgehog LadybirdLadybird SnakeSnake SquirrelsSquirrels BatsBats
  10. 10. AdderAdder  Snakes cannot control theirSnakes cannot control their body heat so the only waybody heat so the only way they can survive in coldthey can survive in cold weather is to go intoweather is to go into hibernationhibernation  Hibernate from October toHibernate from October to AprilApril  They will often goThey will often go underground , in desertedunderground , in deserted rabbit or rodent burrowsrabbit or rodent burrows  They sometimes hibernateThey sometimes hibernate in groups and over 800in groups and over 800 adders were once foundadders were once found hibernating togetherhibernating together
  11. 11.  As the days get longer and warmerAs the days get longer and warmer adders begin to wake upadders begin to wake up  Males sometimes emerge between 2Males sometimes emerge between 2 and 5 weeks before the females, theyand 5 weeks before the females, they shed their skin before setting off inshed their skin before setting off in search of a matesearch of a mate  Fact: Adders are the only venomousFact: Adders are the only venomous snake in Britain!snake in Britain!
  12. 12. HedgehogsHedgehogs  Hedgehogs hibernateHedgehogs hibernate for 5 or 6 monthsfor 5 or 6 months during the winterduring the winter  They prepare for theirThey prepare for their long sleep by eatinglong sleep by eating lots of foodlots of food  They build nests fromThey build nests from leaves and grass inleaves and grass in rabbit burrow,rabbit burrow, hedgerows andhedgerows and underneath compostunderneath compost heapsheaps
  13. 13.  The leafy walls can be ten centimetresThe leafy walls can be ten centimetres thick and provide great insulation fromthick and provide great insulation from the coldthe cold  While they’re asleep their heartbeatWhile they’re asleep their heartbeat goes down from 190 to about 20 beatsgoes down from 190 to about 20 beats per minuteper minute  Body temperature drops to about 10Body temperature drops to about 10 degrees Cdegrees C
  14. 14.  You might think that most hedgehogYou might think that most hedgehog deaths are caused by carsdeaths are caused by cars  More hedgehogs die duringMore hedgehogs die during hibernationshibernations  They can’t protect themselves fromThey can’t protect themselves from rain, flooding, the cold or lack ofrain, flooding, the cold or lack of energy if their fat reserves run outenergy if their fat reserves run out
  15. 15. LadybirdsLadybirds  When their food supplyWhen their food supply gets scarce and thegets scarce and the temperature dropstemperature drops ladybirds find a shelteredladybirds find a sheltered spotspot  Ladybirds stock up on foodLadybirds stock up on food before handbefore hand
  16. 16.  You will find ladybirds under leaf litter,You will find ladybirds under leaf litter, among dead grasses and under stonesamong dead grasses and under stones  2 spot ladybirds hibernate inside your2 spot ladybirds hibernate inside your house.house.  They may form groups of up to 1000They may form groups of up to 1000 individualsindividuals  They hide in cracks round window frames,They hide in cracks round window frames, inside lofts and under loose stonework andinside lofts and under loose stonework and between roof tilesbetween roof tiles
  17. 17. RecapRecap  How do animals prepare for winter?How do animals prepare for winter?  What is hibernation and why doWhat is hibernation and why do animals hibernate?animals hibernate?  Identify some animals that hibernateIdentify some animals that hibernate  What are some dangers ofWhat are some dangers of hibernation?hibernation?

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