I think this is sufficiently dumbed down for you to comprehend:
"What is interesting is that this extensive list includes three animals that we no longer recognize. These three are (in the original Hebrew language)
tanniyn,
b@hemowth (yes, it’s spelled correctly—at least as close as we can get in Roman characters), and
livyathan.
Although we alter the spelling of behemoth and Leviathan slightly, we still use those same words in bibles today. However, tanniyn is always translated into another word when we write it in English. Tanniyn occurs 28 times in the Bible and is normally translated “dragon.” It is also translated “serpent,” “sea monster,” “dinosaur,” “great creature,” and “reptile.” Behemoth and Leviathan are relatively specific creatures, perhaps each was a single kind of animal. Tanniyn is a more general term, and it can be thought of as the original version of the word “dinosaur.” The word “dinosaur” was originally coined in 1841, more than three thousand years
after the Bible first referred to “Tanniyn.” To make things clearer, we constructed the following table comparing the scientific names with the Biblical names tanniyn, behemoth, and Leviathan.
“Dinosaur” Names,
Then and NowName and date first written in the Bible
Scientific Name (best estimate) and date the name appeared:
Tanniyn (dragon)before 1400 BC
Dinosaur 1841 AD
Behemothbefore 1400 BC
Brachiosaurus 1903 AD
Leviathan: before 1400 BC
Kronosaurus 1901 AD
How we got these new names is interesting. In 1822, Mary Ann Mantell became the first person to discover and correctly identify a strange bone as part of a large, unknown reptile. Her husband, Dr. Gideon Mantell, later named this creature an “Iguanodon.” From that time forward, these forgotten animals were given names chosen by the people who
rediscovered them. Of course, the Bible, written between approximately 1450 BC and 95 AD, does not include any of these names."
Dinosaurs and the Bible