By weight, which animal has the largest baby relative to body size? © Getty Images

By weight, which animal has the largest baby relative to body size?

Human childbirth is hard enough – imagine giving birth to a baby half your weight!

Asked by: Emily Cane, Newcastle

Advertisement

Despite a kiwi being about the size of a chicken, the female lays an egg that is about half her weight! It’s so big because it has an enormous yolk, which sustains the chick for the first week of its life. Here you can see some other animals that have enormous babies, as well as those that have teeny tiny offspring (with humans thrown in for good measure).

Kiwi egg (1/2)

<img src=”https://images.immediate.co.uk/volatile/sites/4/2018/07/Baby1_0-c584265.jpg?quality=90&lb=620,413&background=white” srcset=”https://images.immediate.co.uk/volatile/sites/4/2018/07/Baby1_0-c584265.jpg?quality=90&lb=2400,1598&background=white 2400w, https://images.immediate.co.uk/volatile/sites/4/2018/07/Baby1_0-c584265.jpg?quality=90&lb=1920,1278&background=white 1920w, https://images.immediate.co.uk/volatile/sites/4/2018/07/Baby1_0-c584265.jpg?quality=90&lb=1440,959&background=white 1440w, https://images.immediate.co.uk/volatile/sites/4/2018/07/Baby1_0-c584265.jpg?quality=90&lb=1200,799&background=white 1200w, https://images.immediate.co.uk/volatile/sites/4/2018/07/Baby1_0-c584265.jpg?quality=90&lb=960,639&background=white 960w, https://images.immediate.co.uk/volatile/sites/4/2018/07/Baby1_0-c584265.jpg?quality=90&lb=720,479&background=white 720w, https://images.immediate.co.uk/volatile/sites/4/2018/07/Baby1_0-c584265.jpg?quality=90&lb=576,383&background=white 576w, https://images.immediate.co.uk/volatile/sites/4/2018/07/Baby1_0-c584265.jpg?quality=90&lb=360,239&background=white 360w, https://images.immediate.co.uk/volatile/sites/4/2018/07/Baby1_0-c584265.jpg?quality=90&lb=180,119&background=white 180w, ” sizes=”(max-width: 620px) 100vw, 620px” width=”620″ height=”413″ class=”wp-image-2668 size-landscape_thumbnail” alt=”© Alamy” title=”© Alamy” /> © Alamy

Giraffe (1/10)

© Getty Images
© Getty Images

Beluga whale (1/17)

© Getty Images
© Getty Images

Human (1/22)

© Getty Images
© Getty Images

Elephant (1/26)

© Getty Images
© Getty Images

Giant clam (1/500,000,000)

© Getty Images
© Getty Images

Ocean sunfish (1/1,500,000)

© Getty Images
© Getty Images

Red kangaroo (1/100,000)

© Getty Images
© Getty Images

Honey possum (1/2,400)

© Getty Images
© Getty Images

Giant panda (1/900)

© Getty Images
© Getty Images

Advertisement

Subscribe to BBC Focus magazine for fascinating new Q&As every month and follow @sciencefocusQA on Twitter for your daily dose of fun science facts.