The cat brain weighs about 30g.
167
A banana slug can be 6-8 inches and their erect penis can be just as long. Also, their penises emerge from their heads. After sex, banana slugs eat each others penises.
17
Some lizards, in which the tail is a major storage organ for accumulating reserves, will return to a dropped tail after the threat has passed, and will eat it to recover part of the sacrificed supplies.
13
A scorpion can hold its breath for up to 6 days.
19
Dogs sometimes fake being sick to get attention.
26
The colossal squid has the largest eyes in the world.
4