Listener's questions are out! Find out why you might not be able to smell a ladybird, why ladybirds snuggle together in the winter, how they are affected by global warming and more. 

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Sources: 

Overwintering harlequin ladybirds: 

http://www.ace-sap.it/UploadDocs/3270_WATANABE2002.pdf

Ecology of dormancy in ladybird beetles (Coleoptera: Coccinellidae) - Piotr Ceryngier (2015) 

Ceratomegilla undecimnotata - 

https://www.researchgate.net/profile/Vladimir_Kostal/publication/283368646_Accumulation_of_high_concentrations_of_myo-inositol_in_the_overwintering_ladybird_beetle_Ceratomegilla_undecimnotata/links/5657f46108ae1ef9297bf57a.pdf - 

Ladybirds, Naturalist's handbook. Correction: The study showing which ladybirds used up their fat reserves faster was Hariri, 1966 and not 1975. 

https://www.cabdirect.org/cabdirect/abstract/19810583127 - Overwintering of Aphidecta Obliterata in northeastern Scotland, WH Parry.

Hippodamia Arctica's reduction in range in the last 1000 years: https://www.jstor.org/stable/75635?seq=1

Information on 7-spots' behaviour: https://influentialpoints.com/biocontrol/Coccinella_septempunctata_seven-spot_ladybird.htm

https://link.springer.com/article/10.1134/S0013873817090019

https://www.eje.cz/artkey/eje-200801-0001_Why_is_Coccinella_septempunctata_so_successful_A_point-of-view.php?back=%2Fsearch.php%3Fquery%3Dexperimental%252520evidence%252520in%253Aauth%252520name%252520key%252520abstr%26sfrom%3D360%26spage%3D30

Mode of overwintering of invasive H axyridis in the Netherlands: https://link.springer.com/article/10.1007/s10526-011-9394-2 

Toxicity of ladybirds - Orange, 2-spot and pine found to be the most poisonous https://www.nature.com/articles/srep11021

Another study on toxicity of ladybirds https://www.researchgate.net/profile/NM_Marples/publication/226922678_Toxicity_assays_of_ladybirds_using_natural_predators/links/5534dba40cf283a8f60be2e5/Toxicity-assays-of-ladybirds-using-natural-predators.pdf 

Spotlight, Ladybirds by Richard Comont

Field guide to the ladybirds of Great Britain and Northern Ireland by Helen Roy et al.