That particular method of transportation is more common on short sea crossings (e.g. ferries) and usually involves relatively small numbers of animals.

Constantine, if he wished to cross to Asia in order to destroy Licinius' means of further resistance, had to gain control the sea crossings.

As a result, marine channels, navigable rivers and sea crossings formed the trade routes of historic and ancient civilisations.

These controls have been compulsory for air travellers, selective on sea crossings and occasional for land crossings.

The island of Cyprus is a way offshore and there are no sea crossings to Kyrenia/Girne anymore.

However several long sea crossings would still have had to be made.

For example, high speed trains, and, in some cases, short sea crossings offer a more environment-friendly alternative to short flights.

I come from a country - Ireland - where we are two sea crossings from mainland Europe.

I had to take sea crossings and trains, taxis and cars to get here to Strasbourg, which took me over 24 hours without sleep.

I do not mind saying that I myself make 200 sea crossings a year, so I know the ferries.