Hibernation and Migration

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Hibernation and Migration
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Presentation transcript:

Hibernation and Migration WALT: to know what migration and hibernation is WILF: to recall key facts Collate information about bird migration

Adaptation People are always having to adapt or change to different situations For animals adaptation can be a matter of life and death How do we adapt when winter comes?

How do animals prepare for winter? Some head for warmer climates- migration Some will put on a thick coat of fur Some animals head underground for a long winter’s nap

What is hibernation? This is a very special kind of deep sleep It is brought on by short day lengths, cold temperatures and food shortages

Why do animals hibernate? It is a survival strategy Dropping into a deep hibernation means animals are using less energy Food is scarce Animals miss the cold seasons

What are the dangers of hibernation? The animal is defenceless, which means it maybe attacked by predators and eaten!

How do animals prepare for hibernation? They try to put on as much fat as possible because they wont be eating much during the winter This is called brown fat, which is found across the back and shoulders, close to an animal’s organs Brown fat works hard to deliver quick energy to an animal coming out of hibernation

Light Sleepers Some animals are not true hibernators They are easily awakened during their winter slumbers These animals breathe a little more slowly and lower their body temperature a few degrees The wake up to forage between winter snows Bears, skunks, raccoons

Can you think of any animals that hibernate? Bear hedgehog Ladybird Snake Squirrels Bats

Adder Snakes cannot control their body heat so the only way they can survive in cold weather is to go into hibernation Hibernate from October to April They will often go underground , in deserted rabbit or rodent burrows They sometimes hibernate in groups and over 800 adders were once found hibernating together

As the days get longer and warmer adders begin to wake up Males sometimes emerge between 2 and 5 weeks before the females, they shed their skin before setting off in search of a mate Fact: Adders are the only venomous snake in Britain!

Hedgehogs Hedgehogs hibernate for 5 or 6 months during the winter They prepare for their long sleep by eating lots of food They build nests from leaves and grass in rabbit burrow, hedgerows and underneath compost heaps

The leafy walls can be ten centimetres thick and provide great insulation from the cold While they’re asleep their heartbeat goes down from 190 to about 20 beats per minute Body temperature drops to about 10 degrees C

You might think that most hedgehog deaths are caused by cars More hedgehogs die during hibernations They can’t protect themselves from rain, flooding, the cold or lack of energy if their fat reserves run out

Ladybirds When their food supply gets scarce and the temperature drops ladybirds find a sheltered spot Ladybirds stock up on food before hand

You will find ladybirds under leaf litter, among dead grasses and under stones 2 spot ladybirds hibernate inside your house. They may form groups of up to 1000 individuals They hide in cracks round window frames, inside lofts and under loose stonework and between roof tiles

Task Choose an animal that hibernates Write a list for the animal of what it needs to do to prepare for winter? Explain to the animal why it needs to hibernate? Tell the animal some dangers of hibernation?