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Sources:
Bears
http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=24145
https://www.bear.org/website/bear-pages/black-bear/foraging-a-foods/206-what-do-bears-like-to-eat-in-a-beehive.html
http://www.clemson.edu/extension/hgic/hot_topics/2017/pdf/09%20all_about_honey.pdf
http://www.adfg.alaska.gov/index.cfm?adfg=wildlifenews.view_article&articles_id=371
http://articles.extension.org/pages/21751/bee-brood-basic-bee-biology-for-beekeepers
https://defenders.org/grizzly-bear/basic-facts
https://www.ncbi.nlm.nih.gov/pubmed/6998737
https://www.nationalgeographic.com/animals/mammals/a/american-black-bear/
Cats
http://www.vetstreet.com/our-pet-experts/whats-the-deal-with-cats-and-milk
https://www.mayoclinic.org/diseases-conditions/lactose-intolerance/symptoms-causes/syc-20374232
https://www.niddk.nih.gov/health-information/digestive-diseases/lactose-intolerance
https://emedicine.medscape.com/article/187249-overview#a5
Elephant
http://people.duke.edu/~kksmith/papers/Kier_Smith_1985.pdf
https://disneyparks.disney.go.com/blog/2012/09/wildlife-wednesdays-do-elephants-drink-through-their-trunks-this-and-other-questions-answered-on-elephant-awareness-day-september-26-at-disneys-animal-kingdom/
https://elephantconservation.org/elephants/25-things-you-might-not-know-about-elephants/
http://www.asianelephantresearch.com/about-elephant-anatomy-and-biology-p2.php
Rabbits
http://www.bio.miami.edu/hare/diet.html
http://mentalfloss.com/article/62598/do-rabbits-really-love-carrots
https://bmcresnotes.biomedcentral.com/articles/10.1186/1756-0500-7-942
http://www.bio.miami.edu/hare/poop.html
Ducks
https://www.theguardian.com/environment/2015/mar/16/dont-feed-the-ducks-bread-say-conservationists
http://www.huffingtonpost.ca/the-nature-conservancy-of-canada/feeding-bread-to-birds_b_11259694.html
https://www.popsci.com/feeding-ducks-bread
https://www.livescience.com/47031-dont-feed-the-birds.html
http://www.bioone.org/doi/abs/10.1647/1082-6742%282006%2920%5B21%3ABVDOTD%5D2.0.CO%3B2?journalCode=avms&
Ostriches
https://kids.nationalgeographic.com/explore/nature/animal-myths-busted/
http://mentalfloss.com/article/56176/why-do-ostriches-stick-their-heads-sand
http://animals.sandiegozoo.org/animals/ostrich
http://www.audubon.org/news/incubating-bird-eggs-more-complex-you-think
Porcupines
https://www.nationalgeographic.com/animals/mammals/group/porcupines/
http://blogs.discovermagazine.com/notrocketscience/2012/12/11/why-porcupine-quills-slide-in-with-ease-but-come-out-with-difficulty/#.Wib7WVVKvIU
Bats
https://batconservation.org/learn/myths-and-facts-about-bats/
https://news.nationalgeographic.com/news/2014/10/141031-bats-myths-vampires-animals-science-halloween/
https://www.scientificamerican.com/article/how-do-bats-echolocate-an/
Images:
https://en.wikipedia.org/wiki/File:Angelwing.jpg