Udemy: Udemy offers iOS 13 & Swift 5 - The Complete iOS App Development Bootcamp, which is a highly-rated bestselling course with hours of video content walking through everything you need to learn Swift. Swifts: A Guide to the Swift and Treeswifts of the World Phil Chantler Illustrations: Gerald Driessens The taxonomy of the swifts is complicated, with genus and species boundaries widely disputed, especially amongst the swiftlets. Analysis of behavior and vocalizations is complicated by common parallel evolution, while analyses of different morphological traits and of various DNA sequences have yielded equivocal and partly contradictory results. [4] British Trust for Ornithology, BTO, The Nunnery, Thetford, Norfolk IP24 2PU, Tel: +44 (0)1842 750050 Fax: +44 (0)1842 750030 The family name, Apodidae, is derived from the Greek ἄπους ( ápous), meaning "footless", a reference to the small, weak legs of these most aerial of birds. [2] [3] The tradition of depicting swifts without feet continued into the Middle Ages, as seen in the heraldic martlet.

Swifts and Us: The Life of the Bird that Sleeps in the Sky

The book includes detailed instruction, ample illustrations, and clear examples. It teaches you best practices from an experienced Mac and iOS developer. The book emphasizes how to use Xcode, Playgrounds, and REPL. There are a few things to look for that can help you sort through the innumerable Swift books on the market. Resemblances between swifts and swallows are due to convergent evolution, reflecting similar life styles based on catching insects in flight. [1]The first book to clearly study the complicated ecology of these birds. With chapters on exploitation, conservation, and birds'-nest cave management. Since the close of the 16th century AD, the edible nests of swiftlets have roused the perplexed curiosity of European travellers to South-east Asia, while at the same time providing one of the most important constituents of traditional Chinese medicine. For both cultures-western and eastern-this book clarifies the nature of these nests, the troglodytic lives of the birds that build them, and the exploitation of this highly valuable natural resource. Borneo is now the world's most important source of wild edible nests. These are built by three species of swiftlets. Regional differences in management of swiftlets in the various limestone caves of Borneo are reviewed. The authors also describe the emergence of swiftlet house-farming, which they see as inevitable. For many readers this section of the book will be of great interest, outlining the hope of an amalgam between a prosperous domestic industry and sustainable management of wild populations." I always recommend pairing your book with another learning resource, like an interactive or video course, for maximum absorption. I have some options for you — and some of them are free. Swift for Beginners by Boisy G. Pitre accommodates the evolving features of this rapidly adopted language. The book guides you to write Swift code, using Playgrounds to instantly see the results of your work. It gives you a solid grounding in key Swift language concepts including variables, constants, types, arrays, and dictionaries. The wingtip bones of swiftlets are of proportionately greater length than those of most other birds. Changing the angle between the bones of the wingtips and forelimbs allows swifts to alter the shape and area of their wings to increase their efficiency and maneuverability at various speeds. [10] They share with their relatives the hummingbirds a unique ability to rotate their wings from the base, allowing the wing to remain rigid and fully extended and derive power on both the upstroke and downstroke. [11] The downstroke produces both lift and thrust, while the upstroke produces a negative thrust (drag) that is 60% of the thrust generated during the downstrokes, but simultaneously it contributes lift that is also 60% of what is produced during the downstroke. This flight arrangement might benefit the bird's control and maneuverability in the air. [12] Piper, Ross (2007), Extraordinary Animals: An Encyclopedia of Curious and Unusual Animals, Greenwood Press,

Swifts and Us by Sarah Gibson | Waterstones Swifts and Us by Sarah Gibson | Waterstones

Swifts occur on all the continents except Antarctica, but not in the far north, in large deserts, or on many oceanic islands. [14] The swifts of temperate regions are strongly migratory and winter in the tropics. Some species can survive short periods of cold weather by entering torpor, a state similar to hibernation. [13] A step-by-step approach has been employed in every chapter for ease of understanding. The book discusses the concept of data types, variables, constants, loops, decision making, functions, operators, object-oriented programming features, etc. The contents covered in the book are: Swifts live almost entirely in the air. They eat, drink, sleep, mate and gather their nesting materials on the wing, fly thousands of miles across the world, navigating their way around storms, never lighting on tree, cliff or ground, until they return home with the summer. a b c d Collins, Charles T. (1991). Forshaw, Joseph (ed.). Encyclopaedia of Animals: Birds. London: Merehurst Press. pp.134–136. ISBN 1-85391-186-0. Gausset, Quentin (2004). "Chronicle of a Foreseeable Tragedy: Birds' Nests Management in the Niah Caves (Sarawak)". Human Ecology. 32 (4): 487–506. doi: 10.1023/b:huec.0000043517.23277.54. S2CID 154898420.

These are closely related to the treeswifts of the family Hemiprocnidae. There are 4 species of treeswift.