Sheet #49

1. 01

   ReferenceFootball22 cm

   To size upLabrador retriever57 cm

   Measured Shoulder height of a male Labrador

   A dog's height is measured at the withers, the top of the shoulders — not the head.

2. 02

   ReferenceStreet lamppost8 m

   To size upCity bike1.75 m

   Measured Length of an adult city bike

   A 28-inch wheel is about 70 cm across, tyre included.

3. 03

   ReferenceHouse cat76 cm

   To size upCommon frog9 cm

   Measured Body length of an adult common frog

   It also breathes through its skin, especially underwater.

4. 04

   ReferenceTelephone box2.51 m

   To size upQuetzalcoatlus10.5 m

   Measured Estimated wingspan of Quetzalcoatlus northropi

   It is one of the largest flying animals that ever lived.

5. 05

   ReferenceTyrannosaurus12.3 m

   To size upBlue whale24 m

   Measured Length of an adult blue whale

   It is the largest animal known to have ever lived.

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