The aliens tried to avoid human contact.
Snakes avoid human contact if possible, and will try to escape. Snakes are more interested in hunting smaller prey (rats, mice, etc) than humans. If walking in an area known for snakes, then walk noisily. The vibrations will warn of your approach and give the snake time to slither away. The only poisonous snake in the UK, is the Adder. In other countries, some species of snake are more deadly, so it is sensible to avoid such snakes. But, in any case, there is no need to kill snakes.
Yes, rattlesnakes can be found in cities, especially in neighborhoods that are on the fringes of the city and close to the snake's habitat. I live in El Paso, Texas, and rattlesnakes are frequently found within the city limits.
There are three species of snakes native to Denmark: the common European adder, the grass snake, and the smooth snake. These snakes are all non-venomous and typically avoid human contact.
Koalas are not vicious. They will avoid human contact wherever possible.
No. Platypuses avoid contact with humans as much as possible.
It is extremely rare for a snake to eat a human being as they typically do not view humans as prey. Snakes will usually try to avoid humans and will only strike if they feel threatened or cornered. Instances of snakes eating humans are highly uncommon and mostly sensationalized in media.
Not at all - snakes feed on vermin (rats, mice, voles, rabbits etc) which keeps their numbers controlled. The only reason they get a bad press, is because the human race keeps encroaching on their natural habitat - bringing them into closer contact with snakes !
Snakes help the human race by helping women in labor.
snakes can be 2x the age in human years than they are in snake years.
It's likely, but in most cases prefer to leave humans alone and avoid them rather than go out and kill them.
No, snakes are not cannibals. There are snakes that eat other snakes, but cannibals are humans who eat human flesh.