If human sperm are microscopic, then are blue whale sperm larger? If so how large are they?

Gary McLoud, Wiley City, Washington, USA

• "Proportionally the biggest sperm is from a kind of fruit fly and is longer by several times the male fly's own body." So, does he carry it around in a holdall then?

  Annie, Edinburgh, UK

• The Amazonian rangoola dwarf eared mouse has proportionally the largest sperm of any mammal while interestingly enough having the smallest testicles!

  Jayne Johnson, Taunton, England, UK

• Hell, yeah they are bigger dude. I bet you cant even swallow a whale sperm if you tried!

  Ken, Bunbury, Australia